chore(claude): set up workspace rules and code conventions (Step 0)
Bootstrap Claude Code Spec-Driven Development:
- .claude/settings.json: allow safe bash (cd, ls, find, cat, mkdir),
deny .env/secrets and destructive git/rm commands
- .claude/rules/: markdown, file-paths, commits, error-handling,
dev-guidelines (mirrors Salestech Products Development Guidelines)
- .claude/onboarding/step0_preparation/01_code_conventions.md:
document the configuration applied
- .gitignore: track project-level .claude/ config; keep
settings.local.json and .codegraph/ ignored
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