fix: DeploymentStatus ORM binds by member name, Postgres enum expects .value

[shehabyasser-scale]

Summary

One-line fix to the DeploymentORM.status column — pass values_callable= so SQLAlchemy serializes by the enum's .value instead of its member name, matching the Postgres enum created by the companion migration.

Why

Migration agentex/database/migrations/alembic/versions/2026_03_30_1900_deployments_4a9b7787ccd7.py:29 creates the deploymentstatus enum with 'Pending', 'Ready', 'Failed'. The Python enum uses the same strings as .values: PENDING = "Pending", etc.

But the ORM column at agentex/src/adapters/orm.py:241 was declared as plain SQLAlchemyEnum(DeploymentStatus), and SQLAlchemy's default is to serialize Enum members by name. So every INSERT tried to write "READY" / "PENDING" / "FAILED" into a column that only accepts "Ready" / "Pending" / "Failed", and failed with:

asyncpg.exceptions.InvalidTextRepresentationError:
  invalid input value for enum deploymentstatus: "READY"

Introduced in #181. Any agent pod that registers with AGENTEX_DEPLOYMENT_ID (SGP's versioned-deployment flow) crash-loops on startup because register_agent gets a 500, Uvicorn exits with Application startup failed, and k8s restarts the pod forever. Observed on sgp-dev today hitting every agent on the new registration path.

Fix

     status = Column(
-        SQLAlchemyEnum(DeploymentStatus),
+        SQLAlchemyEnum(
+            DeploymentStatus,
+            values_callable=lambda enum_cls: [e.value for e in enum_cls],
+        ),
         nullable=False,
         default=DeploymentStatus.PENDING,
     )

Added a code comment calling out the coupling to the migration so future readers don't re-break this.

Test plan

• Unit tests in agentex/tests/ still green locally (make test or equivalent)
• Fresh agent deploy on sgp-dev with AGENTEX_DEPLOYMENT_ID set — pod registers cleanly, deployment row lands with status = 'Ready', SGP rollout reaches healthy
• Existing agents using the legacy agent.acp_url registration path (no deployment_id) continue to work unchanged
• Promote flow still works — DeploymentStatus.READY comparisons in deployment_repository.py:96-99 still match DB values round-tripped through this binding

Linked

• Linear: EE-45
• Root-caused in feat: versioned deployments with promotion  #181 (didn't flag because that PR's test plan [ ] Verify migration applies cleanly was unchecked)

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