Release v2.19.0

What's Changed

• fix(tests): remove unused imports and classes flagged by CodeQL by @antan87 in #273
• feat(gui): make CLI chat easy to open from workspaces by @antan87 in #274
• Clarify CLI chat start and resume by @antan87 in #275
• Show saved CLI conversation usage in chat by @antan87 in #277
• fix(skills): eliminate file system race in check-development-skills by @antan87 in #276
• fix(core): remove useless assignments to local variables in verify and skill commands by @antan87 in #278
• fix(tests): remove unused imports and variables across test suites flagged by CodeQL by @antan87 in #280
• feat(gui): clarify CLI chat controls and compact inspectors by @antan87 in #279
• feat: make single-repo plans actionable by @antan87 in #281
• feat: clarify planning editor recovery by @antan87 in #283
• chore(release): prepare v2.19.0 by @antan87 in #284

Full Changelog: v2.18.1...v2.19.0