feat(cli): complete code and evidence facades

[solomonneas]

Closes #362.

Summary

• Add executable brigade code sync|context|impact GraphTrail facades.
• Keep brigade search status|doctor|sync plan intact and add tested sync|context|impact compatibility aliases for at least two minor releases or 90 days.
• Add executable brigade evidence crawl|search paths while preserving status, doctor, crawl plan, and export plan.
• Support exact-only structured code-reference searches in the imported evidence engine before lexical fallback.
• Use Brigade's existing engine resolvers, raw argv/stdout/stderr/exit propagation, 30-second query timeouts, and configurable 900-second sync/crawl timeouts.
• Update command discovery, completions, inventory, quickstart, station boundaries, and technical docs.

Compatibility and scope

Existing plan and health JSON keys remain in place. The GraphTrail, graphtrail-mcp, MiseLedger, and sessionfind executable shims are unchanged. This adds no dependency, SQLite schema change, migration, backfill, direct engine coupling, daemon, release cutover, repository archival, or product-page change.

Verification

Captured through Brigade:

• 20260720-075328-work-verify-1c2fe1: Ruff format check, 502 files formatted.
• 20260720-075336-work-verify-43873b: focused facade suite, 66 passed.
• 20260720-075349-work-verify-1486c2: git diff --check, exit 0.
• 20260720-075355-work-verify-7d42b7: ./scripts/verify, 3401 passed, 3 skipped, 82.38% coverage.
• MiseLedger evidence 75d6c377049cd45ffdb35285: focused exact-only Go CLI test, exit 0.
• MiseLedger evidence 323020ff1e6af92d88e74c89: full evidence-ledger Go suite, exit 0.
• Final read-only Brigade review 20260720-080011-b44cf906: merge-ready, no actionable findings.

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