Changelog

Added

• Added remediation checklist and completed first pass.
• Added /changelog page.
• Added version/changelog governance rule in AGENTS.md.

Changed

• Unified listing spec conflicts across spec docs.
• Unified round-1 issue status wording across review/backlog docs.
• Clarified V0 persistence policy: localStorage disabled by default.
• Clarified T0 platform decision wording for pending API runtime provider selection.
• Added version and changelog links in guest/admin headers.