chore(gitignore): ignore local .gstack/ tool scratch

[2233admin]

会话收尾卫生单：.gitignore 增加 .gstack/（gstack 工具本地暂存，与既有 .repowise.backup-* 忽略同类）。

本会话的实质交付已全部经由独立 PR 合入：#102 #107 #108 #109 #110 #116 #117（v0.7.0-beta.3 已发布），以及进行中的 fix/t6-* 三分支。本 PR 仅含这一行。

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c49e7dff-4960-41cb-8bd1-e1aa77f51d02

📥 Commits

Reviewing files that changed from the base of the PR and between 958d10a and e9bd445.

📒 Files selected for processing (1)

• .gitignore

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated repository ignore settings to exclude local command-scratch artifacts.

Walkthrough

The .gitignore file now excludes .gstack/ local command-scratch artifacts.

Changes

Repository hygiene

Layer / File(s)	Summary
Ignore local command artifacts .gitignore	Adds .gstack/ to the ignored paths.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A rabbit tucked the scratch files away,
.gstack/ now stays out of the day.
The clean tree grows,
While the clutter dozes,
And hops through review with no delay.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: ignoring local .gstack/ tool scratch files.
Description check	✅ Passed	The description directly explains the .gitignore change and confirms that the pull request contains only this change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[github-actions]

Code Intel change risk

Score	Percentile	Level
22/100	12th (vs last 49 commits)	🟢 low

Top signals

• Diff shape: 1 file(s), +1/-0 (max file share 1.0)
• Test asymmetry: source changed, tests touched
• Bug-magnet: 1 fix commit(s) in touched files (180d)
• Churn: 7 commit(s) touching these files (90d)

_{revspec: origin/main..HEAD · threshold: percentile >= 90 blocks unless labeled risk-accepted · code-intel change risk}