Add dotclaude configuration files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CLAUDE.local.md.example

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+# Personal Overrides
+
+> Rename this to CLAUDE.local.md — it's gitignored and won't be shared with the team.
+
+## My Preferences
+
+- I prefer verbose commit messages with context
+- Always explain your reasoning before making changes
+- When in doubt, ask rather than guess
+
+## Environment
+
+- My test database runs on port 5433 (not default 5432)
+- Use `pnpm` instead of `npm` on my machine
+
+## Shortcuts
+
+- When I say "ship it", run `/ship`
+- When I say "review", run `/pr-review`
+- When I say "fix it", run `/debug-fix`
+
+## Current Context
+
+- I'm working on the billing module this sprint
+- The staging environment is at https://staging.example.com
+- Feature flags are managed in LaunchDarkly