From 0824a2a940f292adebbf61e8a5acb425bfd78d73 Mon Sep 17 00:00:00 2001
From: Hyde <108911977+Hyaxon@users.noreply.github.com>
Date: Thu, 29 Oct 2026 19:16:55 -0500
Subject: [PATCH] feat: added mermaid to readme

---
 README.md                              |   15 +
 package-lock.json                      | 1326 ++++++++++++++++++++++--
 package.json                           |    3 +-
 src/components/ui/ReadmeDiagrams.astro |  105 ++
 src/pages/projects/[...id].astro       |    2 +
 tests/github-markdown.test.ts          |   28 +
 6 files changed, 1386 insertions(+), 93 deletions(-)
 create mode 100644 src/components/ui/ReadmeDiagrams.astro

diff --git a/README.md b/README.md
index cea8e10..15a251e 100644
--- a/README.md
+++ b/README.md
@@ -146,6 +146,21 @@ Run the README rendering regression checks with:
 npm test
 ```
 
+Project pages render fenced `mermaid` blocks as diagrams, including those in
+GitHub READMEs. For example:
+
+````markdown
+```mermaid
+flowchart LR
+    Source[Schedule JSON] --> Ingestion[Java ingestion]
+    Ingestion --> Data[Canonical data and snapshots]
+```
+````
+
+The renderer loads only when a project contains a Mermaid block. Wide diagrams
+scroll horizontally; invalid diagrams or unavailable JavaScript leave the
+original code block readable.
+
 ### Maintaining the static site
 
 - Page and card selectors read build-time collections. Fetch new external content
diff --git a/package-lock.json b/package-lock.json
index 3461d5e..d90a694 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,8 @@
         "@astrojs/markdown-satteri": "^0.4.1",
         "@astrojs/mdx": "^8.0.1",
         "@astrojs/sitemap": "^3.7.4",
-        "astro": "^7.3.2"
+        "astro": "^7.3.2",
+        "mermaid": "12.2.0"
       },
       "devDependencies": {
         "@astrojs/check": "^0.9.10",
@@ -23,7 +24,20 @@
         "wrangler": "^4.131.1"
       },
       "engines": {
-        "node": ">=22.12.0"
+        "node": "24.x"
+      }
+    },
+    "node_modules/@antfu/install-pkg": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@antfu/install-pkg/-/install-pkg-2.1.0.tgz",
+      "integrity": "sha512-sdg9NxU3zR4Mnawfbc/x6GB5Wf17WYud5qOuEuxXjaKpYpMkISSJEjItGebXJ2bQ4DIcly4NYH23mtkGJjvKUw==",
+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.8.0",
+        "tinyexec": "^1.3.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
       }
     },
     "node_modules/@astrojs/check": {
@@ -480,6 +494,12 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-7.1.2.tgz",
+      "integrity": "sha512-jigsZK+sMF/cuiB7sERuo9V7N9jx+dhmHHnQyDSVdpZwVutaBu7WvNYqMDLSgFgfB30n452TP3vjDAvFC973mA==",
+      "license": "MIT"
+    },
     "node_modules/@bruits/satteri-darwin-arm64": {
       "version": "0.10.5",
       "resolved": "https://registry.npmjs.org/@bruits/satteri-darwin-arm64/-/satteri-darwin-arm64-0.10.5.tgz",
@@ -657,6 +677,43 @@
         "node": ">=18"
       }
     },
+    "node_modules/@chevrotain/cst-dts-gen": {
+      "version": "13.2.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/cst-dts-gen/-/cst-dts-gen-13.2.0.tgz",
+      "integrity": "sha512-bA9dvWlhAUcHkNwU+8w9yiUxJPlj/Lm3VqS7MD+NbIR/7LmpNLuK/AWNFdCo/T3SK5ND0/UHf3IJvl/Jn/i6yg==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/gast": "13.2.0",
+        "@chevrotain/types": "13.2.0"
+      }
+    },
+    "node_modules/@chevrotain/gast": {
+      "version": "13.2.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/gast/-/gast-13.2.0.tgz",
+      "integrity": "sha512-bCARdAsG+eEbOveSXcOAC7pVxA04I1ionzeMOwIYf5NX7SaS7zgn4Dgug2BSqoL+iyKeMNSorQjsFSHJHsCNwg==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/types": "13.2.0"
+      }
+    },
+    "node_modules/@chevrotain/regexp-to-ast": {
+      "version": "13.2.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/regexp-to-ast/-/regexp-to-ast-13.2.0.tgz",
+      "integrity": "sha512-kxpUkLtiaK09ph+dib+Yvm+3sWSnuwlo25gqfKRgTPNmF6H7uW4gVkMjaRdtnN783S9sM6vUNWh9CsxYX4QwKw==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/types": {
+      "version": "13.2.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/types/-/types-13.2.0.tgz",
+      "integrity": "sha512-7qrYHRlKfWf2AvBfJi5eVOrKAkbxvMFsy/iIHTGIiApNcEecCaVIdR+mIQhyCBsTDJxBz4JWXHMo6krbhR9hVg==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/utils": {
+      "version": "13.2.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/utils/-/utils-13.2.0.tgz",
+      "integrity": "sha512-SzKYY68rseOrb9KILVzPsl6SjkQtdWw01SRGB5aCVI5kFcHltQsOYV3JB0Ffst72DgkvHCyDQ0NLwxtmCCf97Q==",
+      "license": "Apache-2.0"
+    },
     "node_modules/@clack/core": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/@clack/core/-/core-1.5.0.tgz",
@@ -1333,6 +1390,23 @@
         "node": ">=18"
       }
     },
+    "node_modules/@iconify/types": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@iconify/types/-/types-2.0.0.tgz",
+      "integrity": "sha512-+wluvCrRhXrhyOmRDJ3q8mux9JkKy5SJ/v8ol2tu4FVjyYvtEzkc/3pK15ET6RKg4b4w4BmTk1+gsCUhf21Ykg==",
+      "license": "MIT"
+    },
+    "node_modules/@iconify/utils": {
+      "version": "3.1.7",
+      "resolved": "https://registry.npmjs.org/@iconify/utils/-/utils-3.1.7.tgz",
+      "integrity": "sha512-JZHlwdID+dy+lTgbYC8NEC4zeugqeYsc6jewvzb4c58kHauJn+X7rNwQjxz5p2qSjqaEeQoLkCIQ9v/H4PK0/w==",
+      "license": "MIT",
+      "dependencies": {
+        "@antfu/install-pkg": "^2.0.1",
+        "@iconify/types": "^2.0.0",
+        "import-meta-resolve": "^4.2.0"
+      }
+    },
     "node_modules/@img/colour": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",
@@ -1906,6 +1980,18 @@
         "@jridgewell/sourcemap-codec": "^1.4.10"
       }
     },
+    "node_modules/@mermaid-js/parser": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@mermaid-js/parser/-/parser-2.0.1.tgz",
+      "integrity": "sha512-j37dj/h6p6pots1L7pLPPNuABEEu9WP4OYg9pW1g+nYG331j0+3canE9OagtYdytYvdSAMG+2fKU5cxep6LgjA==",
+      "license": "MIT",
+      "dependencies": {
+        "@chevrotain/types": "~13.2.0"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.2.3.tgz",
@@ -2465,6 +2551,259 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@types/d3": {
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/@types/d3/-/d3-7.4.3.tgz",
+      "integrity": "sha512-lZXZ9ckh5R8uiFVt8ogUNf+pIrK4EsWrx2Np75WvF/eTpJ0FMHNhjXk8CKEx/+gpHbNQyJWehbFaTvqmHWB3ww==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/d3-axis": "*",
+        "@types/d3-brush": "*",
+        "@types/d3-chord": "*",
+        "@types/d3-color": "*",
+        "@types/d3-contour": "*",
+        "@types/d3-delaunay": "*",
+        "@types/d3-dispatch": "*",
+        "@types/d3-drag": "*",
+        "@types/d3-dsv": "*",
+        "@types/d3-ease": "*",
+        "@types/d3-fetch": "*",
+        "@types/d3-force": "*",
+        "@types/d3-format": "*",
+        "@types/d3-geo": "*",
+        "@types/d3-hierarchy": "*",
+        "@types/d3-interpolate": "*",
+        "@types/d3-path": "*",
+        "@types/d3-polygon": "*",
+        "@types/d3-quadtree": "*",
+        "@types/d3-random": "*",
+        "@types/d3-scale": "*",
+        "@types/d3-scale-chromatic": "*",
+        "@types/d3-selection": "*",
+        "@types/d3-shape": "*",
+        "@types/d3-time": "*",
+        "@types/d3-time-format": "*",
+        "@types/d3-timer": "*",
+        "@types/d3-transition": "*",
+        "@types/d3-zoom": "*"
+      }
+    },
+    "node_modules/@types/d3-array": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/@types/d3-array/-/d3-array-3.2.2.tgz",
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+      },
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+      "resolved": "https://registry.npmjs.org/domutils/-/domutils-3.2.2.tgz",
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+      "license": "BSD-2-Clause",
+      "dependencies": {
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+        "domelementtype": "^2.3.0",
+        "domhandler": "^5.0.3"
+      },
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+        "url": "https://github.com/fb55/domutils?sponsor=1"
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@@ -3237,6 +4156,12 @@
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       }
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+      "resolved": "https://registry.npmjs.org/elkjs/-/elkjs-0.9.3.tgz",
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+    },
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       "license": "MIT"
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+    "node_modules/es-toolkit": {
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+      "resolved": "https://registry.npmjs.org/es-toolkit/-/es-toolkit-1.53.0.tgz",
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+      "license": "MIT",
+      "workspaces": [
+        "docs",
+        "benchmarks",
+        "tests/types",
+        "tests/browser-compat"
+      ]
+    },
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       "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.28.2.tgz",
@@ -3530,6 +4467,12 @@
         "uncrypto": "^0.1.3"
       }
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+    "node_modules/hachure-fill": {
+      "version": "0.5.2",
+      "resolved": "https://registry.npmjs.org/hachure-fill/-/hachure-fill-0.5.2.tgz",
+      "integrity": "sha512-3GKBOn+m2LX9iq+JC1064cSFprJY4jL1jCXTcpnfER5HYE2l/4EfWSGzkPa/ZDBmYI0ZOEj5VHV/eKnPGkHuOg==",
+      "license": "MIT"
+    },
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       "resolved": "https://registry.npmjs.org/hast-util-to-html/-/hast-util-to-html-9.0.5.tgz",
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       "license": "BSD-2-Clause"
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+    "node_modules/iconv-lite": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
+      "integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
+      "license": "MIT",
+      "dependencies": {
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+      },
+      "engines": {
+        "node": ">=0.10.0"
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+      "resolved": "https://registry.npmjs.org/import-meta-resolve/-/import-meta-resolve-4.2.0.tgz",
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+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
+    "node_modules/internmap": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/internmap/-/internmap-2.0.3.tgz",
+      "integrity": "sha512-5Hh7Y1wQbvY5ooGgPbDaL5iYLAPzMTUrjMulskHLH6wnv/A+1q5rgEaiuqEjB+oxGXIVZs1FF+R/KPN3ZSQYYg==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/iron-webcrypto": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/iron-webcrypto/-/iron-webcrypto-1.2.1.tgz",
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       "license": "MIT"
     },
+    "node_modules/katex": {
+      "version": "0.18.10",
+      "resolved": "https://registry.npmjs.org/katex/-/katex-0.18.10.tgz",
+      "integrity": "sha512-/B6p9eY9DX7aHBfpkHdpirDTZ5QH9xTwL9y837PWuzuv41O5jFdqNQwVQEQsimY0/iVNkwBY4+4hMfhQ7d4Dbw==",
+      "funding": [
+        "https://opencollective.com/katex",
+        "https://github.com/sponsors/katex"
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "commander": "^15.0.0"
+      },
+      "bin": {
+        "katex": "cli.js"
+      }
+    },
+    "node_modules/katex/node_modules/commander": {
+      "version": "15.0.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-15.0.0.tgz",
+      "integrity": "sha512-z67u4ZhzCL/Tydu1lJARtEZYWbWaN7oYLHbsuzocr6y4N6WZAagG3RQ4FW61V1/0+jImpj293XfrcYnd1qxtPg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    },
+    "node_modules/khroma": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/khroma/-/khroma-2.1.0.tgz",
+      "integrity": "sha512-Ls993zuzfayK269Svk9hzpeGUKob/sIgZzyHYdjQoAdQetRKpOLj+k/QQQ/6Qi0Yz65mlROrfd+Ev+1+7dz9Kw=="
+    },
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       "version": "4.1.5",
       "resolved": "https://registry.npmjs.org/kleur/-/kleur-4.1.5.tgz",
@@ -3668,6 +4672,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/layout-base": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/layout-base/-/layout-base-1.0.2.tgz",
+      "integrity": "sha512-8h2oVEZNktL4BH2JCOI90iD1yXwL6iNW7KcCKT2QZgQJR2vbqDsldCTPRU9NifTCqHZci57XvQQ15YTu+sTYPg==",
+      "license": "MIT"
+    },
     "node_modules/lightningcss": {
       "version": "1.33.0",
       "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.33.0.tgz",
@@ -3929,6 +4939,12 @@
         "url": "https://opencollective.com/parcel"
       }
     },
+    "node_modules/lodash-es": {
+      "version": "4.18.1",
+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.18.1.tgz",
+      "integrity": "sha512-J8xewKD/Gk22OZbhpOVSwcs60zhd95ESDwezOFuA3/099925PdHJ7OFHNTGtajL3AlZkykD32HykiMo+BIBI8A==",
+      "license": "MIT"
+    },
     "node_modules/lru-cache": {
       "version": "11.5.2",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.5.2.tgz",
@@ -3958,6 +4974,18 @@
         "source-map-js": "^1.2.1"
       }
     },
+    "node_modules/marked": {
+      "version": "16.4.2",
+      "resolved": "https://registry.npmjs.org/marked/-/marked-16.4.2.tgz",
+      "integrity": "sha512-TI3V8YYWvkVf3KJe1dRkpnjs68JUPyEa5vjKrp1XEEJUAOaQc+Qj+L1qWbPd0SJuAdQkFU0h73sXXqwDYxsiDA==",
+      "license": "MIT",
+      "bin": {
+        "marked": "bin/marked.js"
+      },
+      "engines": {
+        "node": ">= 20"
+      }
+    },
     "node_modules/mdast-util-to-hast": {
       "version": "13.2.1",
       "resolved": "https://registry.npmjs.org/mdast-util-to-hast/-/mdast-util-to-hast-13.2.1.tgz",
@@ -3985,6 +5013,40 @@
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       "license": "CC0-1.0"
     },
+    "node_modules/mermaid": {
+      "version": "12.2.0",
+      "resolved": "https://registry.npmjs.org/mermaid/-/mermaid-12.2.0.tgz",
+      "integrity": "sha512-w7nr/SFrLO7BaVTs3dQTvYSV6nYSBj0Yy9DjBhsIJtAcHqRzXSq4Pg32ujHZ/AdWsAMNEvvhbm5dt9E2tOiHzw==",
+      "license": "MIT",
+      "dependencies": {
+        "@braintree/sanitize-url": "^7.1.2",
+        "@iconify/utils": "^3.0.2",
+        "@mermaid-js/parser": "^2.0.1",
+        "@types/d3": "^7.4.3",
+        "@upsetjs/venn.js": "^2.0.0",
+        "chevrotain": "~13.2.0",
+        "cytoscape": "^3.34.0",
+        "cytoscape-cose-bilkent": "^4.1.0",
+        "cytoscape-fcose": "^2.2.0",
+        "d3": "^7.9.0",
+        "d3-sankey": "^0.12.3",
+        "dagre-d3-es": "7.0.14",
+        "dayjs": "^1.11.21",
+        "dompurify": "^3.4.12",
+        "elkjs": "^0.9.3",
+        "es-toolkit": "^1.45.1",
+        "katex": "^0.18.0",
+        "khroma": "^2.1.0",
+        "marked": "^16.3.0",
+        "roughjs": "^4.6.6",
+        "stylis": "^4.3.6",
+        "ts-dedent": "^2.2.0",
+        "uuid": "^11.1.0 || ^12 || ^13 || ^14.0.0"
+      },
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    },
     "node_modules/micromark-util-character": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/micromark-util-character/-/micromark-util-character-2.1.1.tgz",
@@ -4311,6 +5373,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/path-data-parser": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/path-data-parser/-/path-data-parser-0.1.0.tgz",
+      "integrity": "sha512-NOnmBpt5Y2RWbuv0LMzsayp3lVylAHLPUTut412ZA3l+C4uw4ZVkQbjShYCQ8TCpUMdPapr4YjUqLYD6v68j+w==",
+      "license": "MIT"
+    },
     "node_modules/path-to-regexp": {
       "version": "6.3.0",
       "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-6.3.0.tgz",
@@ -4347,6 +5415,22 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/points-on-curve": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/points-on-curve/-/points-on-curve-0.2.0.tgz",
+      "integrity": "sha512-0mYKnYYe9ZcqMCWhUjItv/oHjvgEsfKvnUTg8sAtnHr3GVy7rGkXCb6d5cSyqrWqL4k81b9CPg3urd+T7aop3A==",
+      "license": "MIT"
+    },
+    "node_modules/points-on-path": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/points-on-path/-/points-on-path-0.2.1.tgz",
+      "integrity": "sha512-25ClnWWuw7JbWZcgqY/gJ4FQWadKxGWk+3kR/7kD0tCaDtPPMj7oHu2ToLaVhfpnHrZzYby2w6tUA0eOIuUg8g==",
+      "license": "MIT",
+      "dependencies": {
+        "path-data-parser": "0.1.0",
+        "points-on-curve": "0.2.0"
+      }
+    },
     "node_modules/postcss": {
       "version": "8.5.28",
       "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.28.tgz",
@@ -4521,6 +5605,12 @@
         "url": "https://opencollective.com/unified"
       }
     },
+    "node_modules/robust-predicates": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/robust-predicates/-/robust-predicates-3.0.3.tgz",
+      "integrity": "sha512-NS3levdsRIUOmiJ8FZWCP7LG3QpJyrs/TE0Zpf1yvZu8cAJJ6QMW92H1c7kWpdIHo8RvmLxN/o2JXTKHp74lUA==",
+      "license": "Unlicense"
+    },
     "node_modules/rolldown": {
       "version": "1.2.8",
       "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.2.8.tgz",
@@ -4554,6 +5644,24 @@
         "@rolldown/binding-win32-x64-msvc": "1.2.8"
       }
     },
+    "node_modules/roughjs": {
+      "version": "4.6.6",
+      "resolved": "https://registry.npmjs.org/roughjs/-/roughjs-4.6.6.tgz",
+      "integrity": "sha512-ZUz/69+SYpFN/g/lUlo2FXcIjRkSu3nDarreVdGGndHEBJ6cXPdKguS8JGxwj5HA5xIbVKSmLgr5b3AWxtRfvQ==",
+      "license": "MIT",
+      "dependencies": {
+        "hachure-fill": "^0.5.2",
+        "path-data-parser": "^0.1.0",
+        "points-on-curve": "^0.2.0",
+        "points-on-path": "^0.2.1"
+      }
+    },
+    "node_modules/rw": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/rw/-/rw-1.3.3.tgz",
+      "integrity": "sha512-PdhdWy89SiZogBLaw42zdeqtRJ//zFd2PgQavcICDUgJT5oW10QCRKbJ6bg4r0/UY2M6BWd5tkxuGFRvCkgfHQ==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/s.color": {
       "version": "0.0.15",
       "resolved": "https://registry.npmjs.org/s.color/-/s.color-0.0.15.tgz",
@@ -4561,6 +5669,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "license": "MIT"
+    },
     "node_modules/sass-formatter": {
       "version": "0.8.0",
       "resolved": "https://registry.npmjs.org/sass-formatter/-/sass-formatter-0.8.0.tgz",
@@ -4789,6 +5903,12 @@
         "url": "https://github.com/chalk/strip-ansi?sponsor=1"
       }
     },
+    "node_modules/stylis": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/stylis/-/stylis-4.4.0.tgz",
+      "integrity": "sha512-5Z9ZpRzfuH6l/UAvCPAPUo3665Nk2wLaZU3x+TLHKVzIz33+sbJqbtrYoC3KD4/uVOr2Zp+L0LySezP9OHV9yA==",
+      "license": "MIT"
+    },
     "node_modules/suf-log": {
       "version": "2.5.3",
       "resolved": "https://registry.npmjs.org/suf-log/-/suf-log-2.5.3.tgz",
@@ -4896,6 +6016,15 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/ts-dedent": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/ts-dedent/-/ts-dedent-2.3.0.tgz",
+      "integrity": "sha512-JfJeIHke7y2egdGGgRAvpCwYFUsHlM2gPcrVOxFkznt/4uzQ7HFmvE63iFHVLBJNDuyDOQgijDK/tXH/f6Msjg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.10"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -5170,6 +6299,19 @@
         }
       }
     },
+    "node_modules/uuid": {
+      "version": "14.0.3",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-14.0.3.tgz",
+      "integrity": "sha512-Sc5u1VVln93y1Xnz4R+CunOZc7R9LUcTmhj7Rc7Eg3HVcf7rVn2FOoa812fe0W8p3jD7xeoGSYbfqCGGH2B6xw==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist-node/bin/uuid"
+      }
+    },
     "node_modules/vfile": {
       "version": "6.0.3",
       "resolved": "https://registry.npmjs.org/vfile/-/vfile-6.0.3.tgz",
diff --git a/package.json b/package.json
index 06337fa..7758e11 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,8 @@
     "@astrojs/markdown-satteri": "^0.4.1",
     "@astrojs/mdx": "^8.0.1",
     "@astrojs/sitemap": "^3.7.4",
-    "astro": "^7.3.2"
+    "astro": "^7.3.2",
+    "mermaid": "12.2.0"
   },
   "allowScripts": {
     "esbuild": true
diff --git a/src/components/ui/ReadmeDiagrams.astro b/src/components/ui/ReadmeDiagrams.astro
new file mode 100644
index 0000000..d717900
--- /dev/null
+++ b/src/components/ui/ReadmeDiagrams.astro
@@ -0,0 +1,105 @@
+<script>
+  async function renderDiagrams() {
+    const blocks = document.querySelectorAll<HTMLElement>(
+      '.readme-content pre[data-language="mermaid"], .readme-content pre:has(> code.language-mermaid)',
+    );
+    if (!blocks.length) return;
+
+    // Keep the original code visible until the optional renderer succeeds.
+    const { default: mermaid } = await import("mermaid");
+    await document.fonts.ready;
+    const styles = getComputedStyle(document.documentElement);
+    const token = (name: string) => styles.getPropertyValue(name).trim();
+    mermaid.initialize({
+      startOnLoad: false,
+      securityLevel: "strict",
+      suppressErrorRendering: true,
+      theme: "base",
+      look: "classic",
+      themeVariables: {
+        darkMode: true,
+        useGradient: false,
+        dropShadow: "none",
+        radius: 0,
+        strokeWidth: Number.parseFloat(token("--border-width")),
+        background: token("--color-panel"),
+        primaryColor: token("--color-panel"),
+        primaryTextColor: token("--color-text"),
+        primaryBorderColor: token("--color-border"),
+        nodeBkg: token("--color-panel"),
+        nodeBorder: token("--color-border"),
+        nodeTextColor: token("--color-text"),
+        lineColor: token("--color-border"),
+        textColor: token("--color-text"),
+        secondaryColor: token("--color-bg"),
+        secondaryBorderColor: token("--color-border"),
+        secondaryTextColor: token("--color-text"),
+        tertiaryColor: token("--color-panel"),
+        tertiaryBorderColor: token("--color-border"),
+        tertiaryTextColor: token("--color-text"),
+        edgeLabelBackground: token("--color-panel"),
+        fontFamily: token("--font-mono"),
+        fontSize: "14px",
+        fontWeight: "normal",
+      },
+    });
+
+    for (const [index, block] of blocks.entries()) {
+      const source = block.querySelector("code")?.textContent;
+      if (!source?.trim()) continue;
+      try {
+        const { svg } = await mermaid.render(`readme-diagram-${index}`, source);
+        const diagram = document.createElement("div");
+        diagram.className = "readme-diagram";
+        diagram.tabIndex = 0;
+        diagram.setAttribute("role", "region");
+        diagram.setAttribute(
+          "aria-label",
+          "Mermaid diagram (scroll to explore)",
+        );
+        diagram.innerHTML = svg;
+        // Preserve a readable intrinsic size for wide diagrams on small screens.
+        const graphic = diagram.querySelector("svg");
+        const width = graphic?.viewBox.baseVal.width;
+        if (graphic && width) {
+          graphic.style.width = `${width}px`;
+          graphic.style.maxWidth = "none";
+        }
+        block.replaceWith(diagram);
+      } catch (error) {
+        console.warn(
+          "Unable to render README diagram; keeping its source.",
+          error,
+        );
+      }
+    }
+  }
+
+  void renderDiagrams().catch((error) => {
+    console.warn(
+      "Unable to load README diagrams; keeping their source.",
+      error,
+    );
+  });
+</script>
+
+<style is:global>
+  .readme-diagram {
+    max-width: 100%;
+    overflow-x: auto;
+    margin-block: var(--space-6);
+    padding: var(--space-4);
+    border: var(--border-width) solid var(--color-border);
+    background: var(--color-panel);
+    scrollbar-color: var(--color-border) var(--color-panel);
+  }
+  .readme-diagram > svg {
+    display: block;
+    height: auto;
+    margin-inline: auto;
+  }
+  .readme-diagram:focus-visible {
+    outline: 2px solid var(--color-text);
+    outline-offset: 3px;
+  }
+</style>
diff --git a/src/pages/projects/[...id].astro b/src/pages/projects/[...id].astro
index c8ec807..39b9388 100644
--- a/src/pages/projects/[...id].astro
+++ b/src/pages/projects/[...id].astro
@@ -3,6 +3,7 @@ import { render } from "astro:content";
 import { getProjects } from "../../lib/projects/selectors";
 import BaseLayout from "../../layouts/BaseLayout.astro";
 import ProjectSidebar from "../../components/ui/ProjectSidebar.astro";
+import ReadmeDiagrams from "../../components/ui/ReadmeDiagrams.astro";
 
 export async function getStaticPaths() {
   return (await getProjects()).map((project) => ({
@@ -48,6 +49,7 @@ const isGitHubProject = project.collection === "githubProjects";
       <a href="/">&lt; Home</a>
     </nav>
   </main>
+  <ReadmeDiagrams />
 </BaseLayout>
 
 <style>
diff --git a/tests/github-markdown.test.ts b/tests/github-markdown.test.ts
index b760400..8672c4f 100644
--- a/tests/github-markdown.test.ts
+++ b/tests/github-markdown.test.ts
@@ -1,6 +1,7 @@
 import assert from "node:assert/strict";
 import { test } from "node:test";
 import { createSatteriMarkdownProcessor } from "@astrojs/markdown-satteri";
+import { markdownShikiConfig } from "../src/lib/markdown-theme.ts";
 import {
   githubMarkdownPlugins,
   repositoryUrl,
@@ -10,6 +11,33 @@ const fileURL = new URL(
   "https://github.com/example/project/blob/main/docs/README.md",
 );
 
+test("Mermaid fences retain their language and flowchart source for browser rendering", async () => {
+  const renderer = await createSatteriMarkdownProcessor({
+    ...githubMarkdownPlugins,
+    shikiConfig: markdownShikiConfig,
+  });
+  const source = `flowchart LR
+    Source[Schedule JSON] --> Ingestion[Java ingestion]
+    Ingestion --> Data[Canonical data and snapshots]
+    UI[React frontend] -. API integration pending .-> Backend[Java backend]
+    Data --> Backend
+    Backend -->|HTTP / JSON| Python[Python runner]
+    Data --> Python
+    Python --> Models[Model adapters and algorithms]
+    Models -->|Prediction results| Python
+    Python -->|HTTP / JSON| Backend`;
+  const { code } = await renderer.render(`\`\`\`mermaid\n${source}\n\`\`\``, {
+    fileURL,
+  });
+  assert.match(code, /<pre[^>]*data-language="mermaid"/);
+  const codeContent = code.match(/<code>([\s\S]*?)<\/code>/)?.[1];
+  assert.ok(codeContent);
+  assert.equal(
+    codeContent.replace(/<[^>]*>/g, "").replaceAll("&gt;", ">"),
+    source,
+  );
+});
+
 test("README URLs use the repository branch and README directory", () => {
   assert.equal(
     repositoryUrl("../guide.md#install", fileURL),