# Phase 3 Trigger Model Progress (Event-Native Convergence)

Status: In Progress
Related roadmap: `docs/transition_roadmap_locked.md` (Phase T3)

## Objective
Move write-side toward event-native trigger authority while preserving existing compatibility entrypoints.

## Implemented in this slice

### Additive canonical trigger emission
A canonical write-trigger event stream was introduced:
- `core_memory/write_triggers.py`
- event file: `<CORE_MEMORY_ROOT>/.beads/events/write-triggers.jsonl`

Event envelope fields:
- `event_id`
- `kind=write_trigger`
- `trigger_type`
- `source`
- `payload`
- `created_at`

### Compatibility scripts now emit trigger events
- `extract-beads.py` emits `trigger_type=extract_beads`
- `consolidate.py` emits:
  - `trigger_type=consolidate_session`
  - `trigger_type=rolling_window_refresh`

## Why this is safe
- additive only
- no path changes
- no CLI contract changes
- no artifact path changes
- no replacement of current behavior

## Remaining gap
This slice records trigger authority intent but does not yet make event processing the sole orchestrator. It is a first convergence step, not the final T3 state.
