chore: gitignore Maina local artifacts under .maina/

[beeeku]

Summary

• Ignore per-developer Maina MCP tooling state (sqlite DBs + on-disk caches) generated under .maina/: .maina/cache/, .maina/context/, .maina/*.db.
• Tracked Maina content (constitution.md, decisions/, features/, prompts/) is unaffected.

Why this supersedes #114

PR #114 had the right intent but added .main/ patterns (missing the a) — those match nothing, so the artifacts kept showing up as untracked. CodeRabbit's pre-merge title check flagged the same mismatch. This PR uses the correct .maina/ paths. Recommend closing #114 in favor of this.

Test plan

• Patterns target the real .maina/ directory (confirmed .maina/ is the tracked dir; git ls-files .maina/ = 32 tracked files, all under constitution.md/decisions/features/prompts).
• Confirm Maina cache/db regenerate locally on first use after a fresh checkout.

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[github-actions]

Bundle Size Report

Package	Base	PR	Delta
@workkit/agent	80KiB	80KiB	no change
@workkit/ai	93KiB	93KiB	no change
@workkit/ai-gateway	260KiB	260KiB	no change
@workkit/api	119KiB	119KiB	no change
@workkit/approval	106KiB	106KiB	no change
@workkit/astro	18KiB	18KiB	no change
@workkit/auth	48KiB	48KiB	no change
@workkit/browser	32KiB	32KiB	no change
@workkit/cache	39KiB	39KiB	no change
@workkit/chat	46KiB	46KiB	no change
@workkit/cli	312KiB	312KiB	no change
@workkit/cron	68KiB	68KiB	no change
@workkit/crypto	40KiB	40KiB	no change
@workkit/d1	90KiB	90KiB	no change
@workkit/do	58KiB	58KiB	no change
@workkit/env	43KiB	43KiB	no change
@workkit/errors	40KiB	40KiB	no change
@workkit/features	23KiB	23KiB	no change
@workkit/health	19KiB	19KiB	no change
@workkit/hono	36KiB	36KiB	no change
@workkit/kv	52KiB	52KiB	no change
@workkit/logger	24KiB	24KiB	no change
@workkit/mail	54KiB	54KiB	no change
@workkit/mcp	127KiB	127KiB	no change
@workkit/memory	41KiB	41KiB	no change
@workkit/notify	290KiB	290KiB	no change
@workkit/pdf	36KiB	36KiB	no change
@workkit/queue	54KiB	54KiB	no change
@workkit/r2	57KiB	57KiB	no change
@workkit/ratelimit	51KiB	51KiB	no change
@workkit/realtime	44KiB	44KiB	no change
@workkit/remix	34KiB	34KiB	no change
@workkit/testing	114KiB	114KiB	no change
@workkit/turnstile	14KiB	14KiB	no change
@workkit/types	21KiB	21KiB	no change
@workkit/workflow	46KiB	46KiB	no change

[beeeku]

Branch audit: this PR's diff and #114's diff are byte-identical — both add:

+.maina/cache/
+.maina/context/
+.maina/*.db

#114 does not contain the .main/ (missing a) typo described in this PR's body. That claim originated from CodeRabbit's pre-merge "Title check" on #114, which hallucinated .main/ even though the actual hunk used .maina/. The CodeRabbit walkthrough in the same comment further refers to the patterns as .main/cache/ etc. — so the bot confused itself and the title-mismatch warning followed from the bad summary, not from the diff.

Net: #114 is correct on its own and has been sitting green (verify, Type Check, Test (Node 22), Lint, Bundle Size, Constitution all ✅) for ~22 days. Suggest closing this PR as a duplicate and merging #114 directly. Happy to close this one on your signal.

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Generated by Claude Code