[chore] git hygiene — 3 pre-existing dirty items pollute cluster PRs (surfaced via #137 tangential sweep)

[kiki830621]

Problem

Original observation (surfaced during /idd-plan #137 tangential sweep, Step 2.5):
在準備 #137 + #150 cluster PR(branch idd/137-150-action-scoped-cluster)時,git status 顯示 3 個 pre-existing dirty 項目跟本 session 工作無關:

• .agents/skills/spectra-archive/SKILL.md — 121 lines DELETED(working tree only,未 commit)
• .claude/skills/spectra-archive/SKILL.md — 119 lines DELETED(working tree only,未 commit)
• .claude/.idd/state/chain-spawned-issues.json — untracked,timestamp 2026-05-20

來自 prior session(last related commit f5afb93 multi-root chain 2026-05-20),never staged。 若不處理 → 會被 sweep 進 cluster PR(scope pollution)或留在 working tree 永久 dirty。

Cross-link: surfaced during /idd-plan #137 Step 2.5 Tangential Observations Sweep (per IC_R011 v2.72.0+ file-by-default §1.1).

Type

chore — git hygiene

Expected

Working tree clean(無 unstaged 改動);3 個 dirty 項目都有明確 disposition:

• 兩個 spectra-archive SKILL.md deletions → 確認是 intentional refactor(commit on appropriate branch)或 unintended drift(git checkout)
• chain-spawned-issues.json → 確認是 needed state(commit + 加入 spec)或 stale ephemeral(.gitignore)

Actual

3 個 dirty 項目 5 天以上未處理(2026-05-20 → 2026-05-25 +)。 每次 git commit 都要 selective git add 避免 sweep 進不相關 PR;cluster PR scope review 噪音增加。

Impact

• 本 cluster PR ([META][unattended] Clarity Surface annotation interaction contract with /loop, /idd-all (sister concern from #135) #137 + [META] Codify append-vs-modify discipline as plugin-level principle #150) 必須 selective git add 排除 3 項,否則 PR diff 含 unrelated -237 lines + 1 untracked state file → reviewer 失焦
• 未來每個 PR 都需重複 selective add → high friction
• 真實情況不明:可能該 commit、可能該 revert、可能該 gitignore

Open Questions

1. .agents/spectra-archive 跟 .claude/spectra-archive 為什麼 -237 lines?(原本是 refactor 還是意外 truncate?)
2. chain-spawned-issues.json 是 manifest helper 該 commit 還是 ephemeral per-run state?
3. 整個 .claude/.idd/state/ 應該 git-ignored 還是 git-tracked?

Sister Concerns

• [META] Codify append-vs-modify discipline as plugin-level principle #150 (action-scoped modify discipline,本 cluster PR sibling) — orthogonal;本 chore 不依賴 [META] Codify append-vs-modify discipline as plugin-level principle #150 principle
• 無其他直接 sister

Residue

NSQL §4.6 residue:本 issue 限「working tree dirty 項目 disposition」。 不涵蓋:

• 廣義 git-hygiene CI rule(pre-commit hook 阻擋 dirty merge 等)— 屬 future enhancement
• 整個 .idd/.claude/state/ directory 的 schema codification — 屬 separate proposal

(本 issue 屬 chore tier — routing 預期 Simple,3 個 disposition decisions 屬 single-session triage,non-deliberation。)