fix(security): remediate Trivy HIGH findings on main image

- Bump next 16.2.2 -> 16.2.3 (GHSA-q4gf-8mx6-v5v3 RSC DoS)
- pnpm overrides: minimatch>=10.2.3, picomatch>=4.0.4, tar>=7.5.11
  (CVE-2026-27903/27904, 33671, 29786, 31802)
- Dockerfile runner: apk upgrade --no-cache pulls patched openssl 3.5.6-r0
  and zlib 1.3.2-r0 before installing wget (CVE-2026-28390, 22184)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -63,3 +63,9 @@ design-samples/*.zip
 # QA/automation auto-generated reports (runtime artifacts)
 docs/reports/qa-automation/
 docs/reports/typecheck/
+
+# Claude Code session state
+.claude/scheduled_tasks.lock
+.claude/todos/
+.claude/shell-snapshots/
+.claude/ide/