Add "Repository and Package Identity" rule to both the project-level CLAUDE.md
and the seeded CLAUDE.md template (internal/seed/templates.go). Every new ctask
workspace now inherits guidance against fabricating repo URLs, module paths,
GitHub identities, or remote install commands.
Also adds local-only build/install instructions and data safety invariant
documentation to the project-level CLAUDE.md.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
