# Deterministic phase loop implementation

Implemented `bin/task-phase-loop`.

## Added
- `bin/task-phase-loop`

## Updated
- `docs/task-phase-machine.md`
- `tsconfig.json`

## Behavior
- repeatedly calls `task-phase-run`
- stops on terminal phase:
  - `done`
  - `blocked`
  - `needs_user_decision`
- stops on runner failure
- stops on no material progress fingerprint
- writes loop artifacts under `artifacts/phase-loop-runs/<timestamp>/`
- keeps transition authority in `task-phase-run`, not in the loop

## Output
Prints:
- `task_dir=`
- `loop_dir=`
- `passes=`
- `stop_reason=`
- `final_phase=`
- `evidence_link=`

## Validation
- `bun run typecheck` passes
- loop structure and artifact generation verified locally

## Note
This loop is shaped around the deterministic phase-machine need, not the old generic prompt loop model. It is a thin controller over the gate-enforcing runner.