chore(agents): track Claude AI-team config + git-workflow rule

The recent "Initial import" of main is app-only and dropped .claude/. This
brings the AI-team config into the repo: all 11 .claude/agents/*.md and 11
.claude/skills/*/SKILL.md, each carrying the "Git workflow (every task)" rule
(at task start: commit+push unpushed work, branch off main, build on the
branch, commit+push at the end; mid-chain and read-only agents stay on the
branch and don't re-branch).

Also gitignores the per-user local .claude files (.claude/settings.local.json,
.claude/*.lock) so only the shared team config is tracked. claude_artifacts/
left untracked by choice.

verifier PASS: 23 files staged (22 team + .gitignore); rule byte-identical in
all 22; gitignore scoped so tracked team files stay tracked; branch descends
from origin/main (PRs cleanly).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VEsaHQx8cXr1hFrKU42UK6

.gitignore

@@ -29,3 +29,8 @@ storage-dump.json
 
 # NAS deploy config (not secret, but host-specific)
 .deploy.env
+
+# Claude Code — track the shared team config (.claude/agents, .claude/skills),
+# but keep per-user local files out of git.
+.claude/settings.local.json
+.claude/*.lock