Add note: Green.Durham.Grass.and.Herb is a submodule with its own repo

Author: kiro-agent

modules/Green.Durham.Grass.and.Herb.README.md

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+# Green.Durham.Grass.and.Herb — Separate Repository
+
+**This module is not a regular directory in this repo. It is a git submodule — it has its own repository.**
+
+## What's going on
+
+The path `modules/Green.Durham.Grass.and.Herb` is a **git submodule** (a gitlink,
+tree mode `160000`), not normal files. It is the only submodule in this repo; every
+other entry under `modules/` is an ordinary directory.
+
+Because this repo has no `.gitmodules` file, git has no URL to resolve the submodule
+against, so GitHub shows it as an empty/broken entry and a fresh checkout leaves an
+empty directory. The content lives in its own repository (see link below).
+
+## Pointer details
+
+- **Submodule path:** `modules/Green.Durham.Grass.and.Herb`
+- **Pinned subproject commit:** `e8d1fa05d4c4f45c99836cd6998d1c2a2d1b7cff`
+- **Upstream repository (its own repo):**
+  https://github.com/mearvk/Green.Durham.Grass.and.Herb
+
+> Note: the upstream URL above is the expected location based on the module name and
+> this account's naming convention. If the submodule actually lives elsewhere, update
+> the link here (and, when ready, add a matching `.gitmodules` entry).
+
+## To check it out locally
+
+```sh
+# If/when a .gitmodules entry exists:
+git submodule update --init modules/Green.Durham.Grass.and.Herb
+
+# Or clone it directly as its own repo:
+git clone https://github.com/mearvk/Green.Durham.Grass.and.Herb.git
+cd Green.Durham.Grass.and.Herb
+git checkout e8d1fa05d4c4f45c99836cd6998d1c2a2d1b7cff
+```