# Implementation: fix-dashboard-read-state

## Bug
Dashboard's `determine_task_state()` in `task.py` inferred task phase from artifact filenames only, ignoring the `.state` file. This caused the dashboard to show incorrect states when the `.state` file (source of truth) disagreed with the artifact heuristic.

## Fix
1. Added `_state_string_to_task_state()` helper function that maps state machine phase strings (e.g. `"implement"`, `"code_review:awaiting_approval"`) to `TaskState` enum values. Handles sub-states by splitting on `":"` and using the base phase.
2. Modified `determine_task_state()` to read the `.state` file first. If `.state` exists and maps to a valid `TaskState`, that takes precedence. The artifact heuristic is now a fallback for tasks without `.state` files.

## Files Changed
- `automaton/dashboard/core/task.py`: Added `_state_string_to_task_state()` function, modified `determine_task_state()` to read `.state` before falling back to artifact heuristic

## Tests
- Existing tests in `test_task.py` continue to pass (they test the artifact fallback path since test tasks don't have `.state` files by default)
- All 249 tests pass