Chore: Apply P2-13..P3-22 governance updates#2

Merged

pidster merged 10 commits intomainfrom

chore/p2-13-to-p3-22

Sep 23, 2025

Commits on Sep 19, 2025

chore: declare chat modes SSOT and add SSOT reference notes (P2-13)
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docs: add Testing section and SSOT links to frontend instructions (P2-14)
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docs: enforce ADR save path/versioning and add save/branching rules (P2-15)
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docs: require SMART success metrics via reusable snippet in PRD prompt (P2-16)
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docs: reference docs SSOT and avoid embedding templates in docs prompt (P2-17)
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docs: add status badges and usage example to ROADMAP (P2-18)
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chore: enrich PR description context in settings and add PR template (P2-19)
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ci: add coverage enforcement script and workflow; document adaptation in README (P3-20)
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ci: add markdown lint and link check workflows with configs (P3-21)
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ci: add policy linter for copilot-instructions SSOT tags and sections (P3-22)
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