chore: wire react track into manifests and stack mappings

- agent.yaml: add react-patterns, react-performance, react-testing
  to the skills array; add react-build, react-review, react-test to
  the commands array (alphabetically inserted to satisfy the
  ci/agent-yaml-surface sync test).
- config/project-stack-mappings.json: extend the `react` stack
  entry — add "react" to rules array (was ["common","typescript",
  "web"]); add react-patterns, react-performance, react-testing,
  accessibility to the skills array.
- docs/COMMAND-REGISTRY.json: bump totalCommands 75 -> 78; add
  three new entries (react-build, react-review, react-test) with
  primaryAgents / allAgents / skills wiring. react-review's
  allAgents includes typescript-reviewer to reflect the dual-agent
  routing convention.
- CLAUDE.md: add Skills-table row mapping *.tsx / *.jsx /
  components/** to react-patterns + react-testing skills and
  the /react-review, /react-build, /react-test commands.

agent.yaml

@@ -122,6 +122,9 @@ skills:
   - quarkus-tdd
   - quarkus-verification
   - ralphinho-rfc-pipeline
+  - react-patterns
+  - react-performance
+  - react-testing
   - regex-vs-llm-structured-text
   - repo-scan
   - returns-reverse-logistics
@@ -212,6 +215,9 @@ commands:
   - prune
   - python-review
   - quality-gate
+  - react-build
+  - react-review
+  - react-test
   - refactor-clean
   - resume-session
   - review-pr