fix(windows-ci): enforce LF + build server-node.mjs in CI

Second round of windows-free-tests fixes after the first push. Curated subset
went from 386/34 to 58/4 fails. Remaining 4 fails + 1 error trace to two root
causes:

1. Line-ending sensitivity. Windows checkout with core.autocrlf=true converts
   .md/.tmpl files to CRLF. Tests that parse YAML frontmatter with
   `/^---\n([\\s\\S]+?)\n---/` then return zero matches — skill-collision-
   sentinel.test.ts:120 enumerated 0 skills on Windows, cascading into 3
   downstream test failures (sanity, KNOWN_COLLISIONS, /checkpoint resolved).

   Fix: add .gitattributes that pins LF for .md/.tmpl/.yml/.json/.toml/.sh/
   .ts/.tsx/.js/.mjs/.cjs/.bash. Root-cause fix; prevents future similar
   tests from hitting the same trap. Also keeps bash scripts LF on Linux
   runners (CRLF in shebangs produces "bad interpreter" errors).

2. Module-level Windows assertion in browse/src/cli.ts:82 throws if
   browse/dist/server-node.mjs is missing. Any test that transitively loads
   cli.ts (e.g., browse/test/tab-isolation.test.ts via shard mate imports)
   then fails to even start. server-node.mjs is generated by bash
   browse/scripts/build-node-server.sh, which `bun run build` calls but
   `bun install` does not.

   Fix: add a "Build server-node.mjs" step to .github/workflows/
   windows-free-tests.yml. Calls only the node-server build script, not
   full `bun run build` — we don't need the compiled binaries for tests
   and the full build is slow.

Expected: skill-collision-sentinel goes 0→3 pass (sanity, KNOWN_COLLISIONS,
/checkpoint resolved). tab-isolation's "unhandled error between tests"
disappears. Remaining tests should be green.

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

.gitattributes

@@ -0,0 +1,30 @@
+# Force LF on text files we parse with `\n`-anchored regexes (frontmatter,
+# YAML, markdown structure tests). Without this, Windows checkouts with
+# core.autocrlf=true convert these to CRLF and break tests that match
+# /^---\n...\n---/ against SKILL.md.tmpl frontmatter, etc.
+*.md         text eol=lf
+*.tmpl       text eol=lf
+*.yml        text eol=lf
+*.yaml       text eol=lf
+*.json       text eol=lf
+*.toml       text eol=lf
+
+# Bash scripts must always use LF — CRLF in bash scripts produces bizarre
+# "Bad interpreter" / "command not found" errors on Linux runners.
+*.sh         text eol=lf
+*.bash       text eol=lf
+
+# TypeScript/JavaScript: LF for portability across the bun toolchain.
+*.ts         text eol=lf
+*.tsx        text eol=lf
+*.js         text eol=lf
+*.mjs        text eol=lf
+*.cjs        text eol=lf
+
+# Binary files — never touch.
+*.png        binary
+*.jpg        binary
+*.jpeg       binary
+*.gif        binary
+*.ico        binary
+*.pdf        binary

.github/workflows/windows-free-tests.yml

@@ -47,6 +47,16 @@ jobs:
       - name: Install dependencies
         run: bun install --frozen-lockfile
 
+      - name: Build server-node.mjs (required by Windows browse path)
+        # browse/src/cli.ts module-level throws on Windows if server-node.mjs
+        # is missing — Bun can't drive Playwright's Chromium on Windows
+        # (oven-sh/bun#4253). The bundle must exist for any test that
+        # transitively loads cli.ts to even import. We build only the
+        # Node-compatible server bundle here; full `bun run build` would
+        # also compile every binary which is slow and unnecessary for tests.
+        run: bash browse/scripts/build-node-server.sh
+        shell: bash
+
       - name: Show curated subset (for build log audit trail)
         run: bun run scripts/test-free-shards.ts --windows-only --list
         shell: bash