Merge origin/main into docs/skill-contributing-guardrails

Resolve AGENTS.md conflict: keep this PR's pointer to docs/skill-anatomy.md
(the section main patched via #307 is the one this PR removes, so the
line-level fix is moot once the section is gone).

Also fix a stale path the port reintroduced: skill-anatomy.md referenced
/mnt/skills/user/... for scripts; correct it to the repo-relative
skills/<skill-name>/scripts/<script>.sh, matching #307.

docs/skill-anatomy.md

@@ -126,7 +126,7 @@ When a skill ships runnable helpers under `scripts/`, each script follows these
 - Write status messages to stderr: `echo "Message" >&2`.
 - Write machine-readable output (JSON) to stdout.
 - Include a cleanup trap for temporary files.
-- Reference the script path as `/mnt/skills/user/<skill-name>/scripts/<script>.sh`.
+- Reference the script path as `skills/<skill-name>/scripts/<script>.sh` (repo-relative).
 
 ## Writing Principles