feat(P19): central pipeline contract + shell reproducibility + output streaming (v1.4.1)

---ci---
project: acdl
phase: 19
milestone: v1.4
status: execute
---

Add declarative pipeline contract (schemas/pipeline.schema.json +
pipelines/ci.yaml) as single source of truth for both Gitea Actions (dev)
and GitHub Actions (production) workflows. Both workflow files are
byte-identical and validated against the contract by 32 new tests.

Add scripts/run_ci.sh for shell reproducibility — mirrors the CI pipeline
locally (lint → test → check-only), exits 0 with 'CI PIPELINE OK'.

Update scripts/run_platform.sh to stream output by default: terraform
init/validate/plan via tee, Checkov compliance results with per-record
severity/rule/pass-fail, and emitted Terraform in --check-only. New
--quiet flag for log-only mode.

Requirements: REQ-43 (central pipeline contract), REQ-44 (shell
reproducibility), REQ-45 (output streaming). 122 tests pass (90 + 32).

.ciagent/REQUIREMENTS.md

@@ -91,7 +91,7 @@
 ### Category: End-to-End Verification
 - **REQ-35:** One end-to-end flow: consumer commit to `acdl-consumer-microservice` → pipeline triggered → contract→IR resolution → `terraform plan` → `terraform apply` (dev) → a live ECS Fargate service serving HTTP 200 on its ALB → evidence event written to the DynamoDB outbox → the event renders on the `acdl-evidence` timeline. `scripts/verify_phase16.sh` proves the full flow green.
 
-## v1.3 (Active — module documentation + thin-composition removal)
+## v1.3 (Prior — module documentation + thin-composition removal, complete)
 
 ### Category: Thin-Composition Removal
 - **REQ-36:** The L2 thin-composition layer is removed completely: `composition.json` files, `acdl_platform/contract_resolver.py`, `schemas/contract.schema.json`, `contracts/spike.yaml`, `contracts/microservice.yaml`, and L2 entries in `modules-ir/registry.json` are deleted. The L2 directories are kept as placeholders with READMEs. The downstream pipeline (adapter → checkov → confidence → outbox) is patched to load a pre-existing IR instance instead of resolving a contract.
@@ -109,6 +109,17 @@
 
 - **REQ-42:** `pyproject.toml` exists at the repo root with pytest configuration (testpaths, markers) and the project metadata. `requirements-test.txt` pins test-only dependencies separate from runtime dependencies.
 
+## v1.4 (Active — central pipeline contract + shell reproducibility + streaming)
+
+### Category: Central Pipeline Contract
+- **REQ-43:** A central pipeline contract exists as `schemas/pipeline.schema.json` (JSON Schema draft 2020-12) + `pipelines/ci.yaml` (YAML instance). The contract declares the pipeline name, triggers (push/PR branches), runner, Python version, and stages (name + command + required + install + description). Both `.gitea/workflows/ci.yml` (Gitea Actions, dev) and `.github/workflows/ci.yml` (GitHub Actions, production) implement the same stages, commands, triggers, and runner as declared in the contract. A test (`tests/test_pipeline_contract.py`) validates the contract against the schema and asserts both workflows conform (same jobs, same commands, same triggers, same runner, byte-identical).
+
+### Category: Shell Reproducibility
+- **REQ-44:** `scripts/run_ci.sh` reproduces the CI pipeline locally — runs the same 3 stages (lint, test, check-only) in sequence with proper exit codes, failing on first error. The script exits 0 with "CI PIPELINE OK" on success. A `--quiet` flag suppresses per-stage banners. The script mirrors the central pipeline contract (`pipelines/ci.yaml`) so the shell and CI environments produce identical outcomes.
+
+### Category: Pipeline Streaming
+- **REQ-45:** `scripts/run_platform.sh` streams output by default: terraform init/validate/plan output is piped to stdout via `tee` (visible to the user and logged), Checkov results are printed in human-readable form, and PolicyCheckResult records are displayed with severity, rule ID, and pass/fail status per record. The `--check-only` mode streams the emitted Terraform file content. A `--quiet` flag suppresses streaming (output to log files only) for backwards compatibility. Both gitea and github workflows are byte-identical (identical outcomes — the only difference is the forge runtime).
+
 ## Out of Scope (v1.2)
 
 | REQ | Original criterion | Clarified criterion (effective) | Decision |
@@ -179,7 +190,7 @@
 | REQ-34 | 15 | complete (v1.2.5) |
 | REQ-35 | 16 | partial (v1.2.6, IAM-blocked) |
 
-### v1.3 (active — module documentation + thin-composition removal)
+### v1.3 (prior — module documentation + thin-composition removal, complete)
 
 | Requirement | Phase | Status |
 |-------------|-------|--------|
@@ -189,4 +200,12 @@
 | REQ-39 | 18 | complete (v1.3.2) |
 | REQ-40 | 18 | complete (v1.3.2) |
 | REQ-41 | 18 | complete (v1.3.2) |
-| REQ-42 | 18 | complete (v1.3.2) |
+| REQ-42 | 18 | complete (v1.3.2) |
+
+### v1.4 (active — central pipeline contract + shell reproducibility + streaming)
+
+| Requirement | Phase | Status |
+|-------------|-------|--------|
+| REQ-43 | 19 | complete (v1.4.1) |
+| REQ-44 | 19 | complete (v1.4.1) |
+| REQ-45 | 19 | complete (v1.4.1) |