fix: reject unsafe memory grep regexes

[compoodment]

Summary

• Adds a bounded regex preflight for memory_grep regex mode.
• Rejects nested quantified groups before daemon search/matching.
• Caps regex matching to a bounded prefix of each daemon result instead of running patterns over unbounded result text.
• Adds unit coverage for safe regex matching and unsafe-regex rejection before search.

Fixes #317.

Verification

• pnpm exec tsc --noEmit — PASS
• pnpm run clean:test && pnpm exec tsc -p tsconfig.tests.json && node --test .ts-build/test/unit/memory-recall.test.js — PASS

Note: this is a conservative constrained-regex fix. It does not add RE2 or a worker-level timeout. This branch is stacked on #318 so the test suite can compile.

– Vale

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 564c333d-d8b5-4cec-9edb-16b68b39065f

📥 Commits

Reviewing files that changed from the base of the PR and between 6d47279 and ce8c908.

📒 Files selected for processing (3)

• src/tools/memory-recall.ts
• test/integration/markdown-ingest.test.ts
• test/unit/memory-recall.test.ts

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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