docs(P16): complete workflow-parity-and-script-flags phase (v1.13.19)

---ci---
project: acdl
phase: 16
milestone: v1.14
status: complete
requirements:
  covered: [REQ-150]
  partial: []
---/ci---

.gitea/workflows/README.md

@@ -0,0 +1,40 @@
+# Gitea Workflows — Limitation Documentation (v1.14, REQ-150)
+
+## Shared workflows (byte-identical Gitea + GitHub)
+
+These 3 workflows exist in both `.gitea/workflows/` and `.github/workflows/`
+and are byte-identical (asserted by `tests/test_pipeline_contract.py`):
+
+- `ci.yml` — lint + test + check-only (runs on every PR)
+- `deploy.yml` — reusable deploy workflow (invoked by consumer repos)
+- `modules-lifecycle.yml` — L1 + L2 module lifecycle pipeline (plan-only
+  default, full on workflow_dispatch override)
+
+## GitHub-only workflows (no Gitea mirror)
+
+These 4 workflows exist only in `.github/workflows/`:
+
+- `platform-test.yml` — PR pipeline: lint + unit + integration + schema
+  validation. Uses GitHub Actions features (reusable workflow composition,
+  environment protection) not available in Gitea Actions.
+- `primitives-plan.yml` — PR plan-only matrix over all L1 primitives. Uses
+  GitHub matrix strategy + `terraform plan` against live AWS.
+- `patterns-plan.yml` — PR plan-only matrix over all L2 modules. Same
+  pattern as primitives-plan.
+- `release.yml` — release job on merge to main: computes next semver,
+  creates + updates MAJOR.MINOR.PATCH / MAJOR.MINOR / MAJOR floating tags,
+  creates a GitHub release. GitHub-only by design (Gitea releases are
+  created via the ship workflow's API call, not a workflow).
+
+## Why no Gitea mirror
+
+Gitea Actions (act_runner) has limited support for reusable workflow
+composition, environment protection, and the `gh` CLI used by the release
+job. The 3 shared workflows are the ones that need to run on both forges
+(CI + deploy + lifecycle). The 4 GitHub-only workflows are the
+production-grade platform pipelines that run on GitHub Actions; Gitea is
+the dev/integration forge. Mirroring them would require feature parity
+that Gitea Actions does not currently provide.
+
+This is a documented limitation, not a defect. A future milestone may
+add Gitea mirrors if act_runner gains the required features.

scripts/rotate_spike_key.sh

@@ -13,7 +13,7 @@
 #
 # Spike scope (D-039): the spike user key is per-run-rotated; real OIDC is
 # v1.2 (blocked on go-gitea/gitea#36988).
-set -u
+set -euo pipefail
 ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 cd "$ROOT"
 ENV_FILE="$ROOT/.env.secrets"