feat(inspect): rank findings from session indexes

[drewstone]

Summary

• add a read-only inspection report over session index JSON
• surface ranked findings for loops, tool errors, missing repo attribution, long docs without Contents, invalid JSONL, token-heavy sessions, and skill-run trace-link gaps
• wire the inspect command into the CLI, SDK exports, README, and regression tests

Verification

• pnpm vitest run tests/inspect.test.ts
• pnpm typecheck
• pnpm test
• pnpm build
• pnpm dev index --all --cwd /home/drew/company --last 3 --out /tmp/traces-inspect-company-index.json
• pnpm dev inspect /tmp/traces-inspect-company-index.json --out /tmp/traces-inspect-company.md

[tangletools]

✅ Auto-approved drewstone PR — daedb021

This PR was opened by the trusted drewstone account.
The full PR reviewer audit still runs separately and will publish findings if it detects issues.

_{tangletools · auto-approval · reason: drewstone_author · 2026-07-02T04:57:02Z}

[tangletools]

✅ Auto-approved drewstone PR — 3916b059

This PR was opened by the trusted drewstone account.
The full PR reviewer audit still runs separately and will publish findings if it detects issues.

_{tangletools · auto-approval · reason: drewstone_author · 2026-07-02T04:59:17Z}