docs: remove stale CLI/ecosystem docs, keep framework-only content
Massive cleanup after module extraction sprint. core/go is now a pure
DI framework — docs should reflect that, not document CLI commands.
- Delete 130+ CLI command/example docs (already in core/cli)
- Delete 6 obsolete pkg-batch*-analysis.md files
- Delete plans/, skill/, static/, mcp/ (moved to correct repos)
- Rewrite index.md for DI framework (not CLI)
- Fix PACKAGE_STANDARDS.md: framework.* → core.* references
- Fix log.md: correct framework integration example
Remaining docs: index.md, pkg/PACKAGE_STANDARDS.md, pkg/log.md
Co-Authored-By: Virgil <virgil@lethean.io>
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