v0.7.0

Phase 4 of the 2026-09-28 architecture stabilization, and its gate: the stabilization freeze is lifted. The architecture ratchet now runs in CI, so a change that worsens a metric goes red. Per-stage detail is in docs/stabilization/ROADMAP.md, "Gate 4".

• A sub-workflow path is resolved by one function (library.resolve_sub_workflow_reference) at every site, so a path a run can open is one validation, the realized workflow's digest and the observed-cost lookup can open too.
  • builtin:builtin:x.json no longer loads x.json: only the leading prefix is stripped, so the name builtin:x.json is looked up and reported as SubWorkflowNotFound.
  • At run time a missing builtin: workflow now raises SubWorkflowNotFound (naming the packaged root) instead of validate_workflow_path's missing-file error.
  • The realized workflow's sub-workflow digest and a composed child's observed cost now fall back to the same catalog root, so a catalog sub-workflow a run could open is also digested and costed.
• A run that fails before it opens its run directory no longer rewrites the previous run's manifest.json when the same workflow instance is reused: Workflow.run resets the directory and version it carried.
• The per-variant lines of a kernels "Cannot find a build variant" error are sorted by dw (kernel_availability.stable_message), so the message no longer varies by process.
• The argument_template schema description now says what the code does: handed arguments are held on the child at run time, never written into the definition, and an authored value is the fallback.
• gain_audio rounds a frame-addressed region's end once, as slice_audio does, so a region's end can no longer be one sample off the matching slice's.
• concat_videos refuses a track with no sample rate (concat_videos: '<name>' has audio with no sample rate) instead of joining it unresampled at the wrong speed and pitch; dissolve_videos gives the same message in place of the resample error. Save that step with audio_sample_rate in its result and join the saved file through an output: reference. An unpinned dissolve_videos with such a track now raises this ValueError rather than a TypeError.
• For developers (Python paths only; nothing on the API or MCP reaches them):
  • Workflow's one-line check methods are gone: validation_context, sub_workflow_warnings, adapter_warnings, inherited_vram_warnings, slice_past_end_warnings, shot_span_warnings, null_variable_argument_warnings and cache_hits. Call validation.workflow_context(workflow, ...), validation.run_warning_check(workflow, "<name>", ...) and workflow_run.cache_hits(workflow, arguments).
  • Reference prefixes (variable:, asset:, output:, ...) are read and built only through dw.references; a hand-written prefix check elsewhere fails the prefix_handling ratchet.
  • scripts/arch_metrics.py --check docs/stabilization/baseline.json runs in CI and scripts/preflight.sh, so a PR that raises any architecture metric goes red. The module-size metric is modules_over_size_ceiling (fail over 1,100 lines, warn over 1,000), renamed from modules_over_1000_lines.
  • Agent context: CLAUDE.md files went from 957 to 129 lines; docs/ARCHITECTURE.md is the seam map (concept, owning module, rule, enforced-by).
• The stabilization freeze is lifted (stabilization-gate-4).

What's Changed

• Release 0.7.0 by @dkackman in #571

Full Changelog: v0.6.0...v0.7.0