ci: gate release workflow to manual dispatch

Release builds (auto-versioning + Azure Trusted Signing + Gitea release) no longer
run on every push to main; trigger deliberately via workflow_dispatch. build-and-test.yml
remains the automatic PR/push CI gate.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -2,7 +2,7 @@ name: Release
 
 # SPEC-001 §2/§3/§4 — auto-versioning, signed Windows build, changelog generation, release.
 #
-# On every push to main this workflow:
+# When manually dispatched (gated — not on every push), this workflow:
 #   1. version  — determine the next semver from conventional commits, bump component manifests,
 #                 commit `chore: release vX.Y.Z [skip ci]`, and create + push tag vX.Y.Z.
 #   2. changelog — generate CHANGELOG.md + per-component changelogs with git-cliff (run inside
@@ -19,9 +19,10 @@ name: Release
 # tool that signs PE binaries on Linux, so no Windows runner is required.
 
 on:
-  push:
-    branches:
-      - main
+  # Gated: releases are deliberate, NOT automatic on every push to main.
+  # Trigger manually (Actions -> Release -> Run workflow). Auto-versioning still
+  # computes the next semver from conventional commits at dispatch time.
+  # build-and-test.yml remains the automatic PR/push CI gate.
   workflow_dispatch:
 
 jobs: