feat(gitea): add gitea-workflow skill (human-facing dispatcher)

Adds the human-facing entry point and dispatcher for the Gitea
integration per docs/adr/0011-gitea-skill-deep-modules.md. Preserves
the retired flat skill's default no-args status view (open issues +
open PRs, composed via list_issues/list_pull_requests) and extends
its dispatch table to route ambiguous requests across all 6 domain
skills (issues, labels/milestones, prs, branches, files, releases) —
the old table only covered 4 of these. The skill only calls
gitea-mcp tools directly for the composed status view; every other
operation is a routed handoff to the owning sibling skill, keeping
execution logic (call signatures, gotchas, confirmation gates) owned
in one place.

Bumps plugins/gitea version 1.1.0 -> 1.2.0 in both manifests for the
new skill. Passed structural validation, provenance validation, and
an independent clean-context skill-audit recheck (one finding fixed:
allowed-tools was missing the Skill tool needed for routing).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FNJWdVvdgvZCHi1hZGqgVQ

plugins/gitea/skills/gitea-workflow/references/README.md

@@ -0,0 +1,16 @@
+---
+source_keys:
+  - gitea-mcp-repo
+  - gitea-mcp-slim-go
+  - context7-websites-gitea
+  - context7-gitea-tea-cli
+  - gitea-flat-skill-dispatch
+---
+
+# References
+
+This directory contains provenance metadata and research sources for the `gitea-workflow` skill.
+
+## Files
+
+- `sources.md` — Extracted research sources and their contributing documents