community: add Decision v0.9.0 workflow step

[mnriem]

Description

Resolves #4868.

Add Decision v0.9.0 to the discovery-only community workflow-step catalog and
its community documentation. Pin all five installer file URLs to v0.9.0 and
include the submission's verified SHA-256 digests.

This follows the current manual workflow-step submission process; unlike the
extension/preset/bundle flows, there is no workflow-step validator or PR
generator. Validation was limited to submission metadata, pinned file bytes,
static type declaration, documentation/license availability, and archive
shape. No third-party package was installed, imported, executed, or audited.
A listing is not an endorsement or support commitment.

Preserve submitted runtime compatibility (>=0.11.0) separately from the
>=1.1.0 requirement for the archive installer's --from flag. Compatibility
is advisory, not enforced by the step catalog. The issue lists Markus Wondrak
as author; the catalog uses the release manifest's
spec-kit-decision-step contributors author, with Markus credited as
maintainer in the documentation.

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (if applicable)

Exact checks performed:

• uv sync --extra test --quiet — passed after the initial validation attempt
  found this worktree's .venv/bin/python missing.
• .venv/bin/python -m pytest tests/specify_cli/workflows/step/test_catalog_versions.py tests/contract/test_catalog_schema.py -q
  — passed, 78 tests, before catalog changes.
• .venv/bin/python -m pytest tests/test_workflows.py::TestStepCatalog tests/specify_cli/workflows/step/test_catalog_versions.py tests/specify_cli/workflows/step/test_command_search.py tests/specify_cli/workflows/step/test_command_info.py -q
  — passed, 78 tests, after catalog changes.
• git diff --check — passed.
• A session-local Python metadata check — passed: all five file digests match,
  archive copies match the pinned files, package paths/regular files/limits
  satisfy the contract, manifest name/version/type match, and an AST-only check
  confirms the declared DecisionStep(StepBase) type key. The tagged README,
  changelog, and MIT license exist. The repository catalog entry resolves via
  search/exact-version lookup with installation disallowed; unknown
  queries/versions and an incomplete checksum mapping exercise negative cases.

Not run: the full suite, CLI help, sample-project installation/execution, or
the third-party component's own tests. This is a catalog/documentation-only
change; executing external code is outside the submission review scope. No
existing tests were removed or modified.

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (fill in the disclosure below)

AI disclosure: GitHub Copilot App used GPT-6.1 Sol (gpt-6.1-sol)
for catalog/documentation authoring, release-package validation, and the
commit/push; GPT-6 Sol (gpt-6-sol) completed the PR preparation and
submission. Both acted in autonomous/autopilot mode with default reasoning
settings on behalf of @mnriem. Extent: submission metadata checks, catalog
JSON and documentation authoring, local validation script generation, test
execution, commit/push, and PR description. No third-party executable code
was reviewed, modified, or executed.

[Copilot]

🟢 Approval recommended

The catalog entry and documentation consistently match the submission, release metadata, and discovery-only model.

0 open findings

What changed in this PR

Adds Decision v0.9.0 to the discovery-only community workflow-step catalog.

Changes:

• Adds pinned metadata, file URLs, and SHA-256 digests.
• Documents compatibility, dependencies, and installation requirements.

File	Description
workflows/​step-catalog.community.json	Registers Decision v0.9.0.
docs/​community/​workflow-steps.md	Documents the new community step.

🧠 Review effort: Balanced

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