feat: add upstream sync action and disable existing workflows

Disable all existing GitHub Actions workflows (CodeRabbit, Discord,
docs deploy, quality checks) for this fork by adding `if: false` to
each job. Add new upstream-sync workflow that automatically syncs from
bmad-code-org/BMAD-METHOD every 6 hours via schedule and on manual
dispatch. Creates an issue on sync failure with remediation steps.

https://claude.ai/code/session_01Mxvkj6F7iEbx5sG2jnH4Sm

.github/workflows/coderabbit-review.yaml

@@ -6,6 +6,7 @@ on:
 
 jobs:
   trigger-review:
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     permissions:
       pull-requests: write

.github/workflows/discord.yaml

@@ -12,7 +12,7 @@ env:
 
 jobs:
   pull_request:
-    if: github.event_name == 'pull_request'
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -54,7 +54,7 @@ jobs:
           jq -n --arg content "$MSG" '{content: $content}' | curl -sf --retry 2 -X POST "$WEBHOOK" -H "Content-Type: application/json" -d @-
 
   issues:
-    if: github.event_name == 'issues'
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4

.github/workflows/docs.yaml

@@ -23,6 +23,7 @@ concurrency:
 
 jobs:
   build:
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository

.github/workflows/quality.yaml

@@ -16,6 +16,7 @@ name: Quality & Validation
 
 jobs:
   prettier:
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -34,6 +35,7 @@ jobs:
         run: npm run format:check
 
   eslint:
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -52,6 +54,7 @@ jobs:
         run: npm run lint
 
   markdownlint:
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -70,6 +73,7 @@ jobs:
         run: npm run lint:md
 
   docs:
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -89,6 +93,7 @@ jobs:
         run: npm run docs:build
 
   validate:
+    if: false # disabled – workflow disabled for fork
     runs-on: ubuntu-latest
     steps:
       - name: Checkout

.github/workflows/upstream-sync.yaml

@@ -0,0 +1,54 @@
+name: Upstream Sync
+
+permissions:
+  contents: write
+  issues: write
+  actions: write
+
+on:
+  schedule:
+    - cron: '0 */6 * * *' # every 6 hours
+  workflow_dispatch:
+
+jobs:
+  sync_latest_from_upstream:
+    name: Sync latest commits from upstream repo
+    runs-on: ubuntu-latest
+    if: ${{ github.event.repository.fork }}
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Clean issue notice
+        uses: actions-cool/issues-helper@v3
+        with:
+          actions: 'close-issues'
+          labels: '🚨 Sync Fail'
+
+      - name: Sync upstream changes
+        id: sync
+        uses: aormsby/Fork-Sync-With-Upstream-action@v3.4
+        with:
+          upstream_sync_repo: bmad-code-org/BMAD-METHOD
+          upstream_sync_branch: main
+          target_sync_branch: main
+          target_repo_token: ${{ secrets.GITHUB_TOKEN }}
+          test_mode: false
+
+      - name: Sync check
+        if: failure()
+        uses: actions-cool/issues-helper@v3
+        with:
+          actions: 'create-issue'
+          title: '🚨 Upstream Sync Failed'
+          labels: '🚨 Sync Fail'
+          body: |
+            Due to a change in the workflow file of the [BMAD-METHOD][upstream] upstream repository, GitHub has automatically suspended the scheduled automatic update. You need to manually sync your fork.
+
+            ### How to fix
+            1. Go to your fork on GitHub
+            2. Click **Sync fork** → **Update branch**
+            3. If there are conflicts, clone locally and resolve them
+
+            ![Sync fork button](https://docs.github.com/assets/cb-49937/mw-1440/images/help/repository/sync-fork-dropdown.webp)
+
+            [upstream]: https://github.com/bmad-code-org/BMAD-METHOD