refactor(P57): contract surface redesign + rename + .yml repo-wide

Contract surface redesign:
- New top-level fields: id (3-6 char acronym → stack.name), name (full → stack.title),
  infrastructure (map keyed by module name, replaces module:)
- Drop uses: field (dead reference; version pin lives in CI workflow uses: line)
- Drop top-level module/inputs (now nested under infrastructure map)
- Per-module optional version (defaults to latest published from registry)
- Multi-module contracts: one file deploys N modules in one pipeline run,
  resource IDs namespaced with module name to avoid collisions
- stack.schema.json: add optional title field for display name

Rename:
- pipelines/deploy.yaml → pipelines/contract.yml (declarative spec, not a pipeline)
- pipelines/ci.yaml → pipelines/ci.yml
- All 44 .yaml files → .yml repo-wide (contracts, module examples, kyverno policies)
- .acdl/contract.yaml → .acdl/contract.yml

Resolver (core/contract_resolver.py):
- Rewrite resolve() to loop infrastructure map, default version to latest,
  merge module fragments into one stack with namespaced resource IDs
- _latest_version() picks highest non-deprecated from registry
- _namespace_resources() prefixes IDs + rewrites ref: expressions for multi-module
- Single-module path: unprefixed IDs (backward compatible)

Verification:
- 494 tests pass (0 contract-shape failures)
- Local E2E passes (contract → resolver → adapter → local ECS HTTP 200 → outbox)

---ci---
project: acdl
phase: 57
milestone: v1.10.2
status: execute
---/ci---

.github/workflows/deploy.yml

@@ -1,7 +1,7 @@
 # ACDL Reusable Deploy Workflow — Gitea Actions (dev environment)
 #
 # This reusable workflow implements the central deployment pipeline contract:
-#   pipelines/deploy.yaml (validated against schemas/deploy-pipeline.schema.json)
+#   pipelines/contract.yml (validated against schemas/deploy-pipeline.schema.json)
 #
 # The same contract is implemented by .github/workflows/deploy.yml (GitHub
 # Actions, production). Both files must be byte-identical — the only
@@ -26,7 +26,7 @@
 #      platform log) for auditability.
 #
 # Inputs:
-#   contract  — path to the consumer's contract YAML (default .acdl/contract.yaml)
+#   contract  — path to the consumer's contract YAML (default .acdl/contract.yml)
 #   mode      — full | plan-only | check-only (default full; dev = full apply,
 #               higher environments hold for HITL — the calling repo or the
 #               forge environment gate enforces that)
@@ -51,7 +51,7 @@ on:
       contract:
         description: Path to the consumer contract YAML (in the consumer repo)
         type: string
-        default: .acdl/contract.yaml
+        default: .acdl/contract.yml
       mode:
         description: Pipeline mode — full (apply), plan-only, check-only, or decommission
         type: string