Live smoke against personal:8081 during the v0.15.0 web-companion
verification surfaced that real Worldtree returns persona_state
errors in the FastAPI default envelope shape:
{"detail": {"error_code": "auth_scope_denied", "message": "..."}}
The v0.12.0 `get_persona_state` parser only inspected the top-level
`error_code` key. When the field was nested under `detail`, the
typed exception (AuthScopeDenied / PersonaNotConfigured /
AgentNotAvailable) wasn't raised; the call fell through to
SessionApiFailed, which then surfaced through the web companion as
an opaque HTTP 500 on /api/agents/{id}/persona_state.
The original test_sessions.py mocks used the flat-shape envelope, so
the bug was invisible in unit tests until the real-wire smoke.
Fix: extract error_code from either `err.get("error_code")` (flat)
OR `err.get("detail", {}).get("error_code")` (FastAPI default).
Patch per SemVer discipline — bug fix to v0.12.0 surface, no public
signature change, no new behavior. Callers that were getting the
wrong exception now get the right one; callers that were already
getting the right exception (flat-shape paths) are unchanged.
Tests: 2 new regression cases in TestGetPersonaState — one each for
the detail-envelope shape of 403 auth_scope_denied and 404
persona_not_configured. Suite: 358 passing.
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