chore: gitignore Claude Code state and editor swap files

.claude/ is per-developer agent state (settings, scheduled-task locks),
not project content.  *.swp covers vim swap files (.pyproject.toml.swp
was sitting in working trees).

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

Author: rustyconover

.gitignore

@@ -22,6 +22,10 @@ test-data/v.parquet
 # IDE / editor
 .vscode/
 .idea/
+*.swp
+
+# Claude Code agent state
+.claude/
 
 # Playwright MCP
 .playwright-mcp/