chore: gitignore Claude Code, GSD, and planning directories

Remove .claude/, .bg-shell/, .gsd/, .planning/, and CLAUDE.md
from git tracking. These are local tooling configs that should
not be in the repo.

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

.bg-shell/manifest.json

@@ -1 +0,0 @@
-[]

.gitignore

@@ -30,10 +30,14 @@ renders/
 *~
 .DS_Store
 
-# ─── GSD ──────────────────────────────────────────────────
-.gsd/browser-state/
-.gsd/browser-baselines/
+# ─── Claude Code ──────────────────────────────────────────
+.claude/
+CLAUDE.md
+
+# ─── GSD / GSD v2 ────────────────────────────────────────
+.gsd/
 .bg-shell/
+.planning/
 
 # ─── SSL certs ────────────────────────────────────────────
 services/nginx/certs/*.pem
@@ -42,8 +46,6 @@ services/nginx/certs/*.key
 # ─── Alembic ──────────────────────────────────────────────
 *.db
 
-# ── GSD baseline (auto-generated) ──
-.gsd
 Thumbs.db
 *.code-workspace
 .env.*