oikos phase 0: ontology + inventory + policy seeds, OpenAPI contract, ADRs

- seeds/ontology.yaml: 59 entity types (5 abstract, is-a hierarchy), 46
  relationship types with cardinality, 6 lifecycles with terminal states
  and named precondition checks
- seeds/inventory.yaml: 110 entities / 142 relationships translated from
  legacy inventory.yaml (fleet, services, ingress, storage, governance,
  archaeology); thin spots marked for backfill
- seeds/policy.yaml: 4 risk classes, 27 approval rules (hierarchy-aware,
  per-entity overrides), autonomy kill-switch off (cold start)
- api/openapi.yaml: full v1 REST contract (40 paths), RFC 9457 errors,
  cursor pagination, idempotency, ETag/If-Match, scopes; redocly-clean
- docs/adr/0001-0010: initial architecture decision records
- scripts/validate-seeds.py: Phase 0 gate — hierarchy, lifecycles,
  endpoints, cardinality, policy cross-refs (0 errors)
- plan: layer CHECK gains 'meta' (root type), cardinality gains
  'many-to-one'

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/adr/0006-learning-proposal-only.md

@@ -0,0 +1,23 @@
+# ADR 0006 — Learning is proposal-only (no self-authorization)
+
+Status: accepted (2026-07-07) · Plan: rev 3 (resolves audit S3/S4/SA2)
+
+## Context
+The learning loop (feedback → patterns → skills) informs the classifier
+that decides auto-act vs escalate. If learning could expand its own
+autonomy, poisoned feedback (flapping services, biased probes) could
+unlock destructive auto-act.
+
+## Decision
+The learning engine cannot write to governance (policy/autonomy) tables —
+enforced structurally: its DB role has no grants on them. Pattern
+activation (validated → active) and any autonomy expansion require operator
+approval. Confidence is the Wilson lower bound capped by evidence_count/5;
+anomalous feedback bursts quarantine the pattern; no skill ever
+auto-promotes an action into destructive autonomy (hard-coded). Lowering
+autonomy (kill-switch) is always immediate, never gated.
+
+## Consequences
+- Cold start is slow by design — the agent escalates until trust is earned.
+- The operator is the only path to more autonomy; the audit trail shows
+  every grant.