chore(gitea): regenerate the flat content mirror after the ADR-0020 retrofit

Generated output, not authored content: scripts/sync-plugin-content.sh --all.
Claude Code has no .apm/ awareness, so this compiled mirror must track .apm/ or
the check-plugin-content-sync pre-push hook reports drift.

Deferred to a single commit at the end of the wave on purpose. sync_dir runs
rm -rf before every copy, so running it while seven agents were editing the
same plugin would have raced them; agents were told not to sync for that reason.

Refs #99

plugins/gitea/skills/gitea-issues/references/enrichments.md

@@ -19,8 +19,7 @@ plausibly fits).
 reference files directly by path. A plugin install copies each skill's directory into an isolated
 cache — any file path that leaves this skill's own directory breaks post-install. Instead, compose
 `gitea-labels-milestones` as a skill: describe the task to it (its own `SKILL.md` and description
-trigger it) and consume the resolved IDs it returns. This mirrors how `gitea-labels-milestones`'s
-own description already frames the relationship ("`gitea-issues` and `gitea-prs` both compose it").
+trigger it) and consume the resolved IDs it returns.
 
 ## 1. Label inference