Separate cleanup debt from project attention

[yvette-carlisle]

Summary

• split project cleanup debt counts from manual attention counts
• render dashboard cleanup as its own amber/retained state instead of red attention
• keep post-review cleanup worktrees visible and default-open in recovery

Verification

• cargo test -p decodex operator_dashboard -- --nocapture
• cargo test -p decodex operator_status_snapshot -- --nocapture
• cargo test -p decodex control_plane -- --nocapture
• cargo run -p decodex --bin decodex --quiet -- status --config /Users/x/.codex/decodex/projects/pubfi --json
• api-only dashboard HTTP smoke on 127.0.0.1:8913