v0.25.2 - model-spec artifact hygiene

v0.25.2 - model-spec artifact hygiene

v0.25.2 is a patch release that settles the v0.25 model-spec projection
and release-deliverable hygiene work. The important architectural outcome
is that model descriptions are represented as normal processkit artifacts:
Artifact(kind=model-spec). They are no longer a separate primitive and
are no longer hidden only inside model-recommender JSON when a binding needs
to target them.

This release also tightens pk-doctor so derived projects get early signal
when their local context still contains stale model primitives, non-canonical
model artifact IDs, HTML artifact sidecars, suspicious _0000 artifact
timestamps, or model-assignment bindings that target the old artifact shape.

Highlights

• Model descriptions now ship as timestamped model-spec artifacts in both
  context/artifacts/ and src/context/artifacts/.
• Model-assignment bindings now target timestamped
  Artifact(kind=model-spec) IDs.
• pk-doctor now flags model-spec artifact naming drift and legacy
  ART-model-* binding targets.
• .gitignore.example is now part of the release deliverable under
  src/.gitignore.example.
• Applied and rejected dogfood migrations were archived out of active
  migration state.
• The resolver remains compatible with legacy MODEL-* and ART-model-*
  inputs while canonical bindings use timestamped artifact IDs.

Added

• Timestamped model-spec artifacts:
  ART-YYYYMMDD_HHMM-ModelSpec-<provider>-<family>.md.
• A pk-doctor context-hygiene check for non-timestamped model-spec
  artifact IDs and filenames.
• A pk-doctor context-hygiene check for model-assignment bindings that
  still target old ART-model-* model artifacts.
• src/.gitignore.example in the consumer deliverable, so the gitignore
  example artifact ships with processkit.

Changed

• Model-assignment bindings now target processkit-addressable
  Artifact(kind=model-spec) entities instead of hidden JSON records or the
  short-lived non-timestamped ART-model-* projection.
• migrate_models.py emits canonical timestamped model-spec artifact IDs.
• The release boundary guard accepts only timestamped model-spec artifacts in
  src/context/artifacts/.
• Applied and rejected migrations were archived into context/archives/,
  reducing active context noise while preserving migration history.
• The shipped model-spec projection is mirrored into src/context/ so
  consumers receive model descriptions and bindings in the release tarball.

Fixed

• pk-doctor now catches artifact hygiene issues that previously reached a
  zero-error report:
  • HTML artifacts in active context.
  • suspicious _0000 artifact timestamps.
  • non-timestamped model-spec artifact names.
  • model bindings that still target old model artifact IDs.
• model-recommender resolver compatibility now accepts legacy MODEL-* and
  ART-model-* references during migration while resolving canonical
  timestamped model-spec artifacts.
• context-archiving can serialize archive manifests that contain
  datetime-like metadata.

Compatibility Notes

• Consumers should treat Artifact(kind=model-spec) as the binding target for
  model descriptions.
• The legacy context/models/ primitive projection is removed from the
  processkit deliverable.
• Existing derived projects may still contain old MODEL-* or ART-model-*
  references. The resolver accepts those forms for compatibility, but
  pk-doctor now reports them so projects can migrate to timestamped
  artifact IDs.
• aibox should still own first-line migration generation for derived
  projects; pk-doctor is the fallback and local validation layer.

Release Asset

• Tarball: processkit-v0.25.2.tar.gz
• SHA-256:
  b942c888a2b15fe3cf680405bf0725ce8703d9638291bf8fdf22ce14f035d50a
• Commit:
  2f9e391040244dc83415199e19242e60e06595c2

Verification

• uv run context/skills/processkit/model-recommender/scripts/test_migrate_models.py
  passed: 20 passed.
• uv run --with pytest --with pyyaml pytest context/skills/processkit/model-recommender/scripts/test_resolver.py
  passed: 29 passed.
• uv run context/skills/processkit/pk-doctor/scripts/test_doctor.py passed.
• uv run context/skills/processkit/pk-doctor/scripts/doctor.py --no-log
  passed with 0 ERROR / 0 WARN.
• scripts/check-src-context-drift.sh --release-deliverable passed.
• uv run --script context/skills/processkit/release-audit/scripts/release_audit.py --tree=src-context
  passed with 0 ERROR / 0 WARN.
• uv run scripts/smoke-test-servers.py passed across the MCP smoke suite.
• sha256sum -c processkit-v0.25.2.tar.gz.sha256 passed for the release
  tarball.