fix(docs): sweep the retired engine.build out of the corpus, leaving only the page that says it is gone

src/content/docs/recipes/core/charly-doctor.md

@@ -130,7 +130,7 @@ Each check shows the binary path and version when available, or an install hint
 ## Cross-References
 
 - [`/charly-automation:udev`](/recipes/automation/udev/) — install udev rules for GPU device access
-- [`/charly-core:charly-config`](/recipes/core/charly-config/) — `engine.build`, `engine.run`, `secret_backend` settings, `--no-auto-detect` flag, DRINODE injection via `appendAutoDetectedEnv()`
+- [`/charly-core:charly-config`](/recipes/core/charly-config/) — `engine.run`, `secret_backend` settings, `--no-auto-detect` flag, DRINODE injection via `appendAutoDetectedEnv()`
 - [`/charly-automation:enc`](/recipes/automation/enc/) — credential lookup path behind the Secret Service collection + keyring-index checks; iteration-capable ssClient; broken-collection troubleshooting
 - [`/charly-build:secrets`](/recipes/build/secrets/) — `charly secrets set/list/prune` commands referenced by the keyring-index remediation hint
 - [`/charly-build:settings`](/recipes/build/settings/) — `keyring_collection_label`, `secret_backend`, and other runtime config keys surfaced by the Secret Storage checks

src/content/docs/recipes/core/deploy.md

@@ -471,7 +471,7 @@ Source: `sdk/deploykit/security.go`, `sdk/deploykit/quadlet.go`.
 
 ### Image Transfer
 
-When `engine.build=docker`, `charly config` auto-detects if the image is missing from podman and transfers via `docker save | podman load`. `charly update` re-transfers if needed.
+When `engine.run=docker`, `charly config` auto-detects if the image is missing from podman and transfers via `docker save | podman load`. `charly update` re-transfers if needed.
 
 Source: `sdk/deploykit/quadlet.go` + `sdk/deploykit/quadlet_pod.go` (generation), `charly/commands.go` (command structs).
 

src/content/docs/recipes/core/service.md

@@ -137,7 +137,7 @@ Source: `sdk/deploykit/security.go`, `sdk/deploykit/quadlet.go`.
 
 ### Image Transfer
 
-When `engine.build=docker`, `charly config` auto-detects if the image is missing from podman and transfers via `docker save | podman load`. `charly update` re-transfers if needed.
+When `engine.run=docker`, `charly config` auto-detects if the image is missing from podman and transfers via `docker save | podman load`. `charly update` re-transfers if needed.
 
 ## Direct Mode (Fallback)
 

src/content/docs/recipes/core/shell.md

@@ -165,7 +165,7 @@ workflow.
 
 ## Cross-Engine Image Transfer
 
-When `engine.build` differs from `engine.run`, images are automatically transferred between engines on demand via `<src> save | <dst> load`.
+When a build and a run name different engines, images are automatically transferred between them on demand via `<src> save | <dst> load`.
 
 Source: `dispatchBuildEnsure` (`charly/dispatch_build_ensure.go`) dispatches to candy/plugin-build's `build:ensure` word (`candy/plugin-build/ensure.go`), which calls `kit.TransferImage` (`sdk/kit/transfer.go`, re-exporting `spec/container/transfer.go`). `charly/transfer.go`, this doc's former source citation, no longer exists.