v0.25.8 — MiMo roster and cleanup hints

v0.25.8 is a patch release that adds Xiaomi MiMo to model routing
and teaches processkit release diffs how to emit downstream cleanup
hints for renamed or removed skills.

Added

• Added Xiaomi MiMo-7B-RL-0530 to the model roster. The
  model-recommender now ships a model-spec artifact, quick-reference
  row, detailed profile, and MCP score projection for Xiaomi's
  open-weight MiMo reasoning checkpoint.
• Added cleanup hints to processkit-diff.sh. JSON and TOML output
  now include cleanup_hints for removed upstream-managed skill files,
  renamed skill directories, replacement paths, removed command names,
  and generated command adapters that downstream installers should
  remove.

Changed

• Migration reference docs now describe installer cleanup semantics.
  The migration reference documents how sync tools should interpret
  cleanup_hints, including remove_skill_directory and
  replacement_path.
• Dogfood runtime migration state is current. The local pending
  runtime-home migration was applied and the processkit index now reports
  zero pending migrations.

Fixed

• Fixed processkit-diff.sh under non-GNU awk. Provenance parsing no
  longer depends on GNU awk's match(..., array) extension, so the diff
  script works under mawk.
• Closed GitHub issue #16. Removed and renamed skill cleanup metadata
  is now machine-readable for downstream sync implementations.

Verification

• bash -n scripts/processkit-diff.sh
• uv run --with pyyaml --with pytest --with mcp pytest context/skills/processkit/model-recommender/scripts/test_query_models_filters.py context/skills/processkit/model-recommender/scripts/test_resolver.py context/skills/processkit/model-recommender/scripts/test_default_bindings_coverage.py
• npm --prefix docs-site run build
• uv run scripts/smoke-test-servers.py
• uv run context/skills/processkit/pk-doctor/scripts/doctor.py

---