kit 6.0.0

The deletion major. 6.0 contains ONE change: the deprecation cycle announced
across the 5.x line completes, and the six deprecated MCP tools leave the
surface. No CLI command changes, no config changes, no new capability — if
you never called those six MCP tools, 6.0 is a no-op upgrade. The major
number exists because semver requires removals to happen in one.

Removed

• Six deprecated MCP tools (kit_env, kit_ci, kit_install,
  kit_login, kit_add, kit_standards) are no longer registered — the MCP
  surface lands at 10 tools. Their CLI commands are unchanged; only the
  MCP exposure ends, after notice via runtime deprecation markers (since
  5.16, kit_standards since 5.20), the reference/README rows, and the guide.
  Migrations, all shipped before this removal: kit_review (with
  stages/category) covers the standards gate read-only and scoped;
  kit_context covers env inspection; kit_fix covers tool install;
  kit_run remains the escape hatch for setup-time/CI commands (shell
  contexts by definition). The audience exception list in the contract tests
  is deleted — human/harness commands are now MCP-free with NO exceptions —
  and the docs↔surface fiction gate purged the six names from every listing.

Fixed

• READ_ONLY_SAFE allowlist corrected to the 6.0 truth. The self-audit
  R8 completeness gate caught that the read-only MCP allowlist still carried
  three removed tools and lacked kit_review/kit_map/kit_memory — exactly
  the drift it exists to catch.

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Full changelog: https://github.com/sandstream/kit/blob/v6.0.0/CHANGELOG.md

Verify this release:

git tag -v v6.0.0
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