chore: bump rotatingMachine submodule + gitignore local Claude artifacts

Submodule pointer:
- rotatingMachine @ 8c5822c
    style(editor): drop fixed max-width on rotor SVG — let it fill the panel

Repo hygiene:
- Add .repo-mem/, .codex, CLAUDE.local.md to .gitignore. These are
  per-developer Claude Code state (memory store, IDE marker, per-machine
  conventions) that shouldn't ever land in the repo. .repo-mem alone is
  hundreds of MB on disk.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -14,3 +14,9 @@ npm-debug.log*
 
 # Local tooling env (developer-specific MCP endpoints/tokens)
 tools/.env
+
+# Local-only Claude Code state — memory store, IDE marker, per-machine
+# conventions file. Never commit, never publish.
+.repo-mem/
+.codex
+CLAUDE.local.md