XY-948: Recover active phase goals before retained attention

[acgxv]

Summary

• Recover active implementation/repair phase-goals before routing dirty retained work to operator attention.
• Extend the same recovery path to child-exit retry handling so exhausted child failures can become continuation work when the repo gate proves continued repair is the right next phase.
• Split decodex status attention into current actionable attention vs history-only terminal ledger rows.
• Update runtime and operator-control docs for the new recovery and status semantics.

Root Cause

Decodex treated active phase-goal work with retained tracked changes as terminal partial progress when the app-server or child process exited through failure handling before the phase-goal completion path finalized. That let recoverable implementation/repair lanes fall into decodex:needs-attention even when the correct lifecycle action was to run the repo gate and continue the phase transition.

Validation

• cargo make fmt
• cargo make lint-fix
• cargo make test (1122 passed, 1 skipped)

Notes

The recovery path explicitly stops when the run already recorded terminal or review handoff intent, so manual-attention/review-handoff decisions are not overwritten by phase-goal recovery.