research: git-forge wikis deep dive (Gitea/GitLab/GitHub); UC-76-77

SHARD-WP-0003 T5. The home case: a forge wiki is a separate .wiki.git repo of
Markdown -> page model, history, coordination journal map 1:1 with near-zero
adapter. git-clone universal across all three; wiki content API
capability-varying (GitLab/Gitea yes, GitHub git-only). git IS the canonical
store (not a mirror), so write-by-commit is safe -- resolves the UC-68/Q22
race for this case. UC-76 (clone .wiki.git attach), UC-77 (forge wiki API,
capability varies). Enriched UC-40/02/68/38. Marks T5 done.
Feeds SHARD-WP-0002 T14/T11.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.claude/ralph-loop.local.md

@@ -1,6 +1,6 @@
 ---
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 completion_promise: "HEUREKA"