Added cross-references to doc/ai/module_map.yaml in both developer-
facing guides:
- AGENTS.md:
* Mentioned the AI module map in the Repository Overview and
Quickstart sections.
* Added a common task instructing contributors to consult the map
before making edits.
- DEVELOPING.md:
* Updated “Pointers” to include the AI module map as a source for
per-module paths and known locking hints.
This improves discoverability of module locations and expected locking
patterns for both AI agents (e.g., Codex) and human contributors,
reducing time spent locating code and relevant design notes.
No functional changes; documentation only.
