fix(ci): scope operational workflows to intended trigger windows (#504, #419)

Issue #504: e2e-staging-saas.yml had BOTH push:[main] + pull_request:[main].
This caused the full 25-35 min staging provision+teardown cycle to fire on
every PR push to main (in addition to the push trigger). The pull_request
trigger is removed — branch protection ensures only merged code reaches
main, so push:[main] is sufficient. Pre-merge E2E for provisioning paths
is better served by local harness-replays.yml (which stays push+pull_request).

Issue #419: gate-check-v3.yml had workflow_dispatch.inputs which Gitea
1.22.6 parser rejects with "unknown on type" (it mis-treats the inputs
sub-keys as top-level on: event types). The entire workflow was silently
ignored. Dropping the inputs block restores parsing. Manual dispatch from
the Gitea UI works without the schema (github.event.inputs.X returns
empty; the script iterates all open PRs when PR_NUMBER is empty).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/e2e-staging-saas.yml

@@ -24,17 +24,19 @@ name: E2E Staging SaaS (full lifecycle)
 #     PRs don't need to read.
 #
 # Triggers:
-#   - Push to main (regression guard)
+#   - Push to main (regression guard — fires on merges to main, not on PR updates)
 #   - workflow_dispatch (manual re-run from UI)
 #   - Nightly cron (catches drift even when no pushes land)
-#   - Changes to any provisioning-critical file under PR review (opt-in
-#     via the same paths watcher that e2e-api.yml uses)
+#
+# NOTE: `pull_request` trigger intentionally omitted. This workflow runs a
+# full 25-35 min staging provision + teardown cycle. Firing it on every
+# PR push to main (in addition to the push trigger) causes duplicate runs
+# and wastes runner minutes. Branch protection ensures only merged code
+# reaches main, so the push trigger is sufficient. Pre-merge E2E validation
+# for provisioning-critical paths is better served by local `harness-replays.yml`.
 
 on:
   # Trunk-based (Phase 3 of internal#81): main is the only branch.
-  # Previously this fired on staging push too because staging was a
-  # superset of main and ran the gate ahead of auto-promote; with no
-  # staging branch, main is where E2E gates the deploy.
   push:
     branches: [main]
     paths:
@@ -45,16 +47,7 @@ on:
       - 'workspace-server/internal/provisioner/**'
       - 'tests/e2e/test_staging_full_saas.sh'
       - '.gitea/workflows/e2e-staging-saas.yml'
-  pull_request:
-    branches: [main]
-    paths:
-      - 'workspace-server/internal/handlers/registry.go'
-      - 'workspace-server/internal/handlers/workspace_provision.go'
-      - 'workspace-server/internal/handlers/a2a_proxy.go'
-      - 'workspace-server/internal/middleware/**'
-      - 'workspace-server/internal/provisioner/**'
-      - 'tests/e2e/test_staging_full_saas.sh'
-      - '.gitea/workflows/e2e-staging-saas.yml'
+  workflow_dispatch:
   schedule:
     # 07:00 UTC every day — catches AMI drift, WorkOS cert rotation,
     # Cloudflare API regressions, etc. even on quiet days.

.gitea/workflows/gate-check-v3.yml

@@ -23,17 +23,14 @@ on:
   schedule:
     # Hourly: refresh all open PRs
     - cron: '8 * * * *'
+  # NOTE: `workflow_dispatch.inputs` block intentionally omitted.
+  # Gitea 1.22.6 parser rejects `workflow_dispatch.inputs.X` with
+  # "unknown on type" — it mis-treats the inputs sub-keys as top-level
+  # `on:` event types. Dropping the inputs block restores parsing.
+  # Manual dispatch from the Gitea UI works without the inputs schema
+  # (github.event.inputs.X returns empty); the script falls back to
+  # iterating all open PRs when PR_NUMBER is empty.
   workflow_dispatch:
-    inputs:
-      pr_number:
-        description: 'PR number to check (omit for all open PRs)'
-        required: false
-        type: string
-      post_comment:
-        description: 'Post comment on PR'
-        required: false
-        type: string
-        default: 'true'
 
 env:
   GITHUB_SERVER_URL: https://git.moleculesai.app