docs: trim repeated boilerplate in git, gitea, and bin skills

Finding 13: five blocks of near-identical wording were repeated across
skills within a plugin — the gitea "resolve owner and repo" step (5
skills), the 404-masks-403 note (6 files), the manual pagination
explanation (8 files), the git plugin's main/master force-push refusal
(7 files, some with multiple internal restatements), and the bin
skills' domain-glossary/ADR paragraph (5 skills). Tightened each
instance in place — same meaning, fewer words — rather than extracting
to a shared file, which ADR-0014's one-file-per-skill install
constraint rules out. Left the three git skills' structured-result
JSON shapes alone (coupled to the separate, out-of-scope git-orchestrate
merge candidate, finding 19).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YR2CjVumUbEGWcMikcoXBD

SIMPLIFICATION-AUDIT.md

@@ -99,7 +99,8 @@ The shared pattern: per-skill `README.md` files no model reads, a `docs/research
 12. [x] ~~**Strip ADR and changelog narration from model-facing files.** `ADR-0020` is cited in 3 of 7 kyberforge SKILL.md files and 16 references; ADR-0023 is cited inline 21 times in the git plugin. Examples: "was the old house rule and ADR-0020 deleted it", "were removed per ADR-0015 once issue #90 landed", "this file previously recorded `list_issues` as having neither a `type` nor a `milestones` parameter". `skill-author/references/retrofit.md` (197 lines) is a one-time migration guide; it is loaded from `improve.md` and listed in `sources.md`, so remove those in the same change. These belong in git history or the ADR, not in context. Effort S.~~
    > **Done (2026-09-12):** see commit `edcc57c` on `docs/simplification-audit`. Historical narration stripped from kyberforge (ADR-0020) and git (ADR-0023) skill content; `retrofit.md` deleted along with its load-step and `sources.md` entries. Caught in review: some `ADR-0023` tags were not narration but the `check-rtk-prefix` hook's required opt-out marker for intentionally-bare git commands — those 12 were restored, not left stripped.
 
-13. **State repeated boilerplate once or delete it.** A near-identical "Resolve owner and repo" block in 5 of 7 gitea skills; 404-masks-403 in 6 files; manual pagination in 7; main/master refusal in 9 git files; the "use the project's domain glossary, respect ADRs" paragraph in 5 bin skills. Three git skills define three different structured-result JSON shapes whose only consumer is `git-orchestrate` (finding 19). Effort S.
+13. [x] ~~**State repeated boilerplate once or delete it.** A near-identical "Resolve owner and repo" block in 5 of 7 gitea skills; 404-masks-403 in 6 files; manual pagination in 7; main/master refusal in 9 git files; the "use the project's domain glossary, respect ADRs" paragraph in 5 bin skills. Three git skills define three different structured-result JSON shapes whose only consumer is `git-orchestrate` (finding 19). Effort S.~~
+    > **Done (2026-09-12):** see commit `b4c3d5e`. Trimmed each repeated instance in place — same meaning, fewer words — rather than extracting to a shared file (blocked by the one-file-per-skill install constraint, ADR-0014): the "Resolve owner and repo" block across 5 `gitea-*` skills, the 404-masks-403 note across 6 gitea files, the manual-pagination explanation across 8 gitea files, the main/master force-push refusal across 7 git plugin files (some with multiple internal restatements), and the domain-glossary/ADR paragraph across 5 `bin` skills. This was a trim-in-place pass, not a merge: the cross-skill duplication itself remains and is coupled to the (out-of-scope) skill-merge findings 19/20. Left the three git skills' structured-result JSON shapes untouched, as directed. Verified no regressions with `scripts/skill-size-check.sh` (pre/post diff) and `claude plugin validate` on both plugins.
 
 ### 4.2 kyberforge (290 files, 44,568 lines incl. mirror; the 7 SKILL.md bodies are 333 lines, under 1%)