AK-508: ignore coding-agent review-findings dirs (.architect/, .reviewer/)

[benw5483]

Summary

• This repository had no .gitignore. This adds one.
• Ignores the .architect/ and .reviewer/ directories that automated review tooling writes at the root of a working tree. They hold internal run identifiers and raw review commentary, so a broad git add -A recovery could otherwise sweep them into a pull request.
• Adds a .DS_Store baseline. No node_modules/ or __pycache__ entries, because this repository carries only Markdown, a LICENSE, and one shell script.

The explanatory comment above the two entries is deliberate. It tells the next reader why the entries exist, so they are not deleted later as noise.

Verification

Nothing matching the new patterns was already tracked. git ls-files | grep -E '^\.(architect|reviewer)/' returns empty on this branch, so no committed file becomes untracked and nothing needs removing. This is the check that mattered most here: had it come back non-empty, findings would already be in the history and cleaning them out would be a separate and more careful job than adding an ignore rule.

The change is additive only. It creates one new file, removes no existing ignore entry, reorders nothing, and touches no other file in the repository.

The rules were exercised rather than assumed. With .architect/round-1.findings.json and .reviewer/round-1.findings.json present on disk:

Check	Result
git status --porcelain	shows only ?? .gitignore, the findings files are invisible
git check-ignore -v	attributes them to .gitignore:7:.architect/ and .gitignore:8:.reviewer/
git add -A --dry-run	stages .gitignore alone, so the sweep this guards against no longer picks them up

Both scratch directories were removed afterward; the working tree is clean.

Test plan

• Confirm git ls-files | grep -E '^\.(architect|reviewer)/' is empty on main.
• Create .architect/x.json and .reviewer/x.json locally, then confirm git status stays clean and git add -A --dry-run does not stage them.
• Confirm the diff adds .gitignore only.

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• City: factory-main · Agent: local-core.builder-2
• On behalf of: @benw5483