An earlier anchor-edit silently failed, so POST /sessions/{id}/next-node and
GET /escalations were never added (they 404'd). Add both, anchored on the real
/escalate-without-walk route.
Phase-1 test_l1_endpoints tests used POST /intake to create adhoc setup sessions,
but Phase 2A intake now dispatches via match_or_build (build/matched/suggest/
out_of_scope — never adhoc). Add a _create_adhoc_session service helper and route
the step/notes/resolve/escalate/cross-account setup through it; rewrite
test_intake_adhoc as test_intake_build_creates_ai_build_session (mocked outcome).
All green: test_l1_endpoints + test_l1_api_ai_build = 25 passed; full Phase 2A
backend service/unit/model suite = 56 passed; notification suite = 18 passed.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Mounts /api/v1/l1/* with require_l1_or_coverage on every route. Intake
creates an internal ticket and starts a flow OR adhoc session (PSA queue
merge follows in Phase 2). Step/notes/resolve/escalate delegate to
l1_session_service. escalate-without-walk creates an immediately-
escalated session for the BuildAbortedNoKB path.
ValueError from services → 400. Cross-account session access → 404.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
