fix: resolve multiple reported issues (#205, #182, #188, #172, #173) (#207)

* fix: resolve multiple reported issues (#205, #182, #188, #172, #173)

- fix(observe.sh): replace triple-quote JSON parsing with stdin pipe to
  prevent ~49% parse failures on payloads with quotes/backslashes/unicode
- fix(hooks.json): correct matcher syntax to use simple tool name regexes
  instead of unsupported logical expressions; move command/path filtering
  into hook scripts; use exit code 2 for blocking hooks
- fix(skills): quote YAML descriptions containing colons in 3 skill files
  and add missing frontmatter to 2 skill files for Codex CLI compatibility
- feat(rules): add paths: filters to all 15 language-specific rule files
  so they only load when working on matching file types
- fix(agents): align model fields with CONTRIBUTING.md recommendations
  (opus for planner/architect, sonnet for reviewers/workers, haiku for
  doc-updater)

* ci: use AgentShield GitHub Action instead of npx

Switch from npx ecc-agentshield to uses: affaan-m/agentshield@v1
for proper GitHub Action demo and marketplace visibility.

agents/e2e-runner.md

@@ -2,7 +2,7 @@
 name: e2e-runner
 description: End-to-end testing specialist using Vercel Agent Browser (preferred) with Playwright fallback. Use PROACTIVELY for generating, maintaining, and running E2E tests. Manages test journeys, quarantines flaky tests, uploads artifacts (screenshots, videos, traces), and ensures critical user flows work.
 tools: ["Read", "Write", "Edit", "Bash", "Grep", "Glob"]
-model: opus
+model: sonnet
 ---
 
 # E2E Test Runner