ci(preflight): extract preflight steps into a composite action

Same 5-step preflight body (setup-bun, setup-node, cache, install,
lint, format:check) was duplicated across 5 workflows. Move it to
.github/actions/preflight/action.yml so future tweaks (adding
typecheck, swapping the cache key, etc.) are a single-file change.

Net diff: +33 / -65.

Addresses the "shared preflight" follow-up Vai called out on #877.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jrusso1020

.github/actions/preflight/action.yml

@@ -0,0 +1,31 @@
+name: Preflight
+description: |
+  Cheap lint + format gate that runs before expensive CI jobs (regression
+  shards, perf shards, parity renders, Windows renders, catalog previews).
+  Single source of truth for the gate's bun/node/cache/lint/format steps —
+  tweak here and every preflight job picks it up.
+
+runs:
+  using: composite
+  steps:
+    - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
+
+    - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
+      with:
+        node-version: 22
+
+    - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4
+      with:
+        path: ~/.bun/install/cache
+        key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
+        restore-keys: |
+          bun-${{ runner.os }}-
+
+    - shell: bash
+      run: bun install --frozen-lockfile
+
+    - shell: bash
+      run: bun run lint
+
+    - shell: bash
+      run: bun run format:check

.github/workflows/catalog-previews.yml

@@ -23,19 +23,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
-      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
-      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
-        with:
-          node-version: 22
-      - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4
-        with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: |
-            bun-${{ runner.os }}-
-      - run: bun install --frozen-lockfile
-      - run: bun run lint
-      - run: bun run format:check
+      - uses: ./.github/actions/preflight
 
   render-previews:
     name: Render catalog previews

.github/workflows/player-perf.yml

@@ -45,19 +45,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
-      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
-      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
-        with:
-          node-version: 22
-      - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4
-        with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: |
-            bun-${{ runner.os }}-
-      - run: bun install --frozen-lockfile
-      - run: bun run lint
-      - run: bun run format:check
+      - uses: ./.github/actions/preflight
 
   perf-shards:
     name: "Perf: ${{ matrix.shard }}"

.github/workflows/preview-regression.yml

@@ -49,19 +49,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
-      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
-      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
-        with:
-          node-version: 22
-      - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4
-        with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: |
-            bun-${{ runner.os }}-
-      - run: bun install --frozen-lockfile
-      - run: bun run lint
-      - run: bun run format:check
+      - uses: ./.github/actions/preflight
 
   preview-parity:
     name: Preview parity

.github/workflows/regression.yml

@@ -42,19 +42,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
-      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
-      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
-        with:
-          node-version: 22
-      - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4
-        with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: |
-            bun-${{ runner.os }}-
-      - run: bun install --frozen-lockfile
-      - run: bun run lint
-      - run: bun run format:check
+      - uses: ./.github/actions/preflight
 
   regression-shards:
     needs: [changes, preflight]

.github/workflows/windows-render.yml

@@ -67,19 +67,7 @@ jobs:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           ref: ${{ github.event.inputs.ref }}
-      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
-      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
-        with:
-          node-version: 22
-      - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4
-        with:
-          path: ~/.bun/install/cache
-          key: bun-${{ runner.os }}-${{ hashFiles('bun.lock') }}
-          restore-keys: |
-            bun-${{ runner.os }}-
-      - run: bun install --frozen-lockfile
-      - run: bun run lint
-      - run: bun run format:check
+      - uses: ./.github/actions/preflight
 
   render-windows:
     name: Render on windows-latest