Implement all 5 tasks: additive extension model, framework self-enforcement, changelog, project migration, dashboard review

CHANGELOG.md

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+# Changelog
+
+## [unreleased]
+
+### Added
+- Blocked phase column between Verification and Resolution on dashboard (#additive-extension-model)
+- Framework self-enforcement rules in .rules.md and system-prompt.md (#framework-self-enforcement)
+- Additive extension model: projects extend via extensions/ dir, never copy framework files (#additive-extension-model)
+- CHANGELOG.md for release notes tracking (#changelog)
+- Framework audit: comprehensive self-consistency check with RESEARCH.md (#framework-audit)
+
+### Changed
+- prompts/orchestrate.md: always reads prompts/contracts/scripts from global, project extensions are additive (#additive-extension-model)
+- prompts/onboarding.md: removed diff/merge upgrade, replaced with migration check (#additive-extension-model)
+- README.md: updated upgrade docs for new additive model (#additive-extension-model)
+- scripts/update.sh: simplified to plain git pull (#additive-extension-model)
+- .rules.md: converted from template to concrete rules with Task-Driven Development, VRAM-aware sizing, Changelog, and Self-Improvement sections (#framework-self-enforcement)
+- system-prompt.md: added instruction to read global .rules.md (#framework-self-enforcement)