v0.6.4 — lesson-11 (mcp typo pool) + heartbeat snapshot + dashboard tool

v0.6.4 — lesson + tooling (2026-07-04)

Added

• misakanet-50/lesson-11-mcp-typo-pool-x3-merged.md — real-empirical
  lesson covering 2 PRs (#1382, #1383) + 1 marker-pattern (#1373 + #1375);
  distills the pattern: 1-file-per-PR, copy maintainer tone, mcp docs-only
  diffs (domains: pr-strategy, tooling; confidence: 0.91)
• scripts/heartbeat.py — daily validator snapshot; last run:
  2026-07-04T14:08:46 GMT+8 with 60 files / 0 errors / 0 warnings
• scripts/dashboard.py — lists every PR Case Study open / in-flight /
  pending (sorts by days_idle desc; flags stale at ≥14d / ≥30d)

Updated

• KNOWN_ISSUES.md tracker — bumped snapshot count and TRACKED_REPOS
  (added agentic-community/mcp-gateway-registry)

Stats

• 12 profiles / 12 case studies / 11 lessons / 5 anti-patterns
• validate.py --strict: 0 errors