v0.3.0

docs: update README and indexes for new features

- README: add format router, differential response, predictive cache,
  MCP server to strategy list and token savings table
- README: update architecture tree with new modules (cache, mcp,
  encoding/, shape_analyzer, format_router)
- README: add CLI usage for compress-auto, mcp start, hook diff
- README.zh.md: sync all changes to Chinese version
- docs/index.md: add specs 0011-0014
- specs/index.md: add specs 0011-0014
- specs/0010: update innovation roadmap with status markers