IAM Profile consumption doc + claim fixtures; close FLEX-WP-0005

Completes FLEX-WP-0005 T05 and closes the Foundations and Topaz
Alignment workstream.

docs/iam-profile-consumption.md captures flex-auth's input surface
against NetKingdom IAM Profile v0.1:
- boundary (flex-auth consumes verified claims; upstream layer
  validates signatures and audiences)
- normalized input envelope (matches Markitect's EnterpriseIdentity)
- required, recommended, and tolerated claim variations
- role-claim location union (top-level / realm_access / resource_access)
- scope encoding (string vs array)
- principal-type detection (human / service / emergency)
- group-overage and freshness expectations
- production vs local-development handling

examples/claims/ ships five contract fixtures:
- key-cape-lightweight.yaml (profile minimum)
- keycloak-heavy.yaml (full variation set + MFA)
- service-account.yaml (svc-* hub-to-hub)
- emergency.yaml (break-glass with incident metadata)
- keycloak-group-overage.yaml (Entra-style hasgroups: true)

All fixtures parse as valid YAML. They become contract tests for the
standalone evaluator (FLEX-WP-0002 P2.4) and the Topaz adapter
(FLEX-WP-0004 T01); both code paths must produce identical normalized
envelopes for the same fixture.

FLEX-WP-0005 workstream marked status=done in this file and completed
in the State Hub. FLEX-WP-0002 is now fully unblocked.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

examples/claims/service-account.yaml

@@ -0,0 +1,20 @@
+# Claim envelope for a hub-to-hub service account (client_credentials
+# grant). Profile-required `service` role, scoped tightly to the
+# operation it performs. No preferred_username (service identities are
+# named after the service and environment per the profile).
+#
+# Reference: NetKingdom IAM Profile v0.1 §"Service Account Flow" and
+# §"Hub-to-Hub Service Account Pattern".
+
+iss: https://sso.netkingdom.example/realms/netkingdom
+sub: svc-markitect-tool-prod
+aud:
+  - flex-auth
+exp: 4102444800
+iat: 1767225600
+azp: svc-markitect-tool-prod
+client_id: svc-markitect-tool-prod
+scope: hub:read hub:capability
+roles:
+  - service
+  - operator