refactor coordinator to use shared lib models and client

bin/coordinator/REFACTORING_STATUS.md

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+# Coordinator Refactoring Status
+
+## ✅ Completed
+
+1. **SupervisorTransport trait created** - `lib/clients/supervisor`
+2. **Mycelium transport moved** - `lib/clients/supervisor/src/transports/mycelium.rs`
+3. **SupervisorClient made generic** - `SupervisorClient<T: SupervisorTransport>`
+4. **Coordinator client updated** - Uses `SupervisorClient<MyceliumTransport>`
+5. **Job type migrated** - Now uses `hero_job::Job`
+6. **Job validation added** - `job.validate_required_fields()`, `job.validate_context()`
+7. **Old validation removed** - Removed `validate_job()` from service.rs
+
+## 🔄 In Progress - Coordinator Code Updates
+
+The coordinator needs updates throughout to use the new Job API:
+
+### Required Changes:
+
+1. **Method calls → Field access**:
+   - `job.id()` → `job.id`
+   - `job.caller_id()` → `job.caller_id`
+   - `job.context_id()` → `job.context_id`
+
+2. **Field name changes**:
+   - `job.script` → `job.payload`
+   - `job.script_type` → `job.executor`
+
+3. **ID type changes**:
+   - Change from `u32` to `String` throughout
+   - Update HashMap keys, function signatures, database queries
+
+4. **Status handling**:
+   - Remove `job.status()` calls
+   - Status is tracked separately in coordinator state
+
+5. **Workflow fields** (depends, prerequisites):
+   - These don't exist on `hero_job::Job`
+   - Stored in `JobSummary` for DAG operations
+   - Need separate storage/tracking
+
+### Files Needing Updates (~41 errors):
+
+- `service.rs` - Job CRUD operations, method→field changes
+- `dag.rs` - Workflow orchestration, depends/prerequisites handling
+- `rpc.rs` - RPC handlers, ID type changes
+- `router.rs` - Job routing, already partially updated
+- Database queries - ID type changes
+
+### Next Steps:
+
+1. Update `service.rs` - Replace method calls with field access
+2. Update `dag.rs` - Handle workflow fields from JobSummary
+3. Update `rpc.rs` - Handle String IDs
+4. Update database layer - String ID support
+5. Test compilation
+6. Integration testing
+
+## Architecture Summary
+
+```
+lib/clients/supervisor/
+├── src/
+│   ├── lib.rs (SupervisorClient<T>, HttpTransport, trait)
+│   └── transports/
+│       ├── mod.rs
+│       └── mycelium.rs (MyceliumClient, MyceliumTransport, SupervisorHub)
+
+bin/coordinator/
+├── models/
+│   └── job.rs (re-exports hero_job::Job with validation)
+├── service.rs (needs updates)
+├── dag.rs (needs updates)
+├── rpc.rs (needs updates)
+└── router.rs (updated)
+```
+
+## Notes
+
+- `hero_job::Job` uses String UUIDs for IDs
+- Workflow orchestration (depends, prerequisites) handled by JobSummary
+- Job status tracked separately in coordinator state machine
+- Validation methods added to Job model for coordinator use