chore: expand .gitignore for editor, OS, and local agent artifacts

Author: rajannpatel

.gitignore

@@ -1,11 +1,53 @@
 # sdkcraft build artifacts
 *.sdk
-
-# spread reuse state (created when a previous run leaves instances around)
-.spread-reuse.yaml
+.craft/
 
 # sdkcraft build lifecycle directories (local --destructive-mode builds)
-.craft/
 parts/
 prime/
 stage/
+
+# spread reuse state (created when a previous run leaves instances around)
+.spread-reuse.yaml
+
+# editor
+.vscode/
+!.vscode/
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+.idea/
+*.swp
+
+# OS
+.DS_Store
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Local scratchpads and AI configs
+.claude/
+!.claude/
+.claude/*
+!.claude/commands/
+!.claude/commands/*.md
+.agents/local/
+.agents/**/*.local.md
+.agents/**/*.personal.md
+.agents/**/*.local.yaml
+.agents/**/*.personal.yaml
+.agents/**/*.local.yml
+.agents/**/*.personal.yml
+.workshop-local/
+.workshop.lock
+workshop.local.*
+scratch/
+
+# Local wiki clone for agent context
+.wiki/
+
+# Local preview and coverage
+local-*/
+coverage/