2026.08.26 - Chain Dashboard UI - Planning

[lanhhoang]

• Add the planning documents for the run-chain dashboard UI migration and run-chain input repair, scoped to a 9-phase plan series under docs/plans/
• Add phase 1–9 plan documents covering dependency baseline, chain input repair, dashboard foundation, live widgets, agents menu, inline renderers, fleet list, conversation viewer, and release verification
• Planning only: no source/test/agent/chain edits, no commits, no auto-fix or formatting commands beyond the plan additions