Update workflow-preset to v3.2.1

[bigsmartben]

Summary

• Update the bundled workflow-preset snapshot to v3.2.1.
• Update the bundled and community preset catalogs with source-backed release metadata.
• Add the single Requirement Gate contract introduced by source issues Point bundled Repository Governance at v3.0.2 #50–chore: release 0.12.6, begin 0.12.7.dev0 development #57.

Submission route: pr-template
Catalog type: preset
Source repository: https://github.com/bigsmartben/spec-kit-workflow-preset
Source version: v3.2.1
Source commit: 6e80f25d0334f9e71504b46223565a517b2dedb8
Download URL: https://github.com/bigsmartben/spec-kit-workflow-preset/releases/download/v3.2.1/spec-kit-workflow-preset-v3.2.1.zip
Release manifest: https://github.com/bigsmartben/spec-kit-workflow-preset/releases/download/v3.2.1/spec-kit-workflow-preset-v3.2.1.manifest.json
Artifact SHA-256: 6667df31c2828be89e6d2256c38e60d207749e783c38dd5efb3f3dbe2c15261b

Validation

• python3 -m unittest tests/test_preset_contract.py — 113 tests
• Release ZIP and manifest SHA-256/file inventory verification — 56 files
• specify install/resolve smoke test with Core Implement hash preservation
• python3 -m pytest tests/test_presets.py -k 'workflow_preset' — 5 tests
• Community integration validation
• uv run --extra test pytest — 3,891 passed, 88 skipped