0.6.2 — approve an edited plan exactly as reviewed

• Local /planmode show [file] displays one complete plan up to 64 KiB and captures its review. Typed approval of a
  changed or explicitly named unsubmitted file requires that same activation, path and current digest, while idle.
• A reviewed replacement becomes approved rev N+1 once. Implementation receives the complete captured text and an
  approved snapshot path, even with approved_text off; later edits to the working file do not change that approval.
• Add /planmode edit [file] with external-editor save → show → approve instructions, and ask TUI/Desktop plan
  replies to include a markdown file link. Chat and oversized displays do not arm edited-plan approval.
• Keep-planning feedback reports saved-file changes in the live card result and next planning turn, asking the agent
  to read and preserve them before submitting a complete new revision.