fix: resolve 3 protocol bugs, improve CLI and snapshot code quality (#487)

## Summary

- Fix `allowFileAccess` being silently stripped from launch commands by adding it to the Zod schema in `protocol.ts` (the `--allow-file-access` CLI flag was not reaching the browser)
- Fix `trace stop` requiring a path argument despite help text documenting it as optional -- now works with or without a path
- Fix `addscript`/`addstyle` silently succeeding when neither `content` nor `url` is provided -- now returns a validation error
- Replace hardcoded ANSI escape code with `color::error_indicator()` in `main.rs` to respect `NO_COLOR`
- Fix double-parse pattern and add descriptive expect messages in `commands.rs`
- Fix incomplete string escaping in `snapshot.ts` `buildSelector` (use `JSON.stringify` instead of manual quote escaping)
- Simplify redundant ternary in `snapshot.ts` cursor-interactive role assignment
- Sync docs changelog with CHANGELOG.md (v0.8.1 through v0.10.0)

src/protocol.test.ts

@@ -582,6 +582,22 @@ describe('parseCommand', () => {
       const result = parseCommand(cmd({ id: '1', action: 'launch', ignoreHTTPSErrors: 'true' }));
       expect(result.success).toBe(false);
     });
+
+    it('should parse launch with allowFileAccess true', () => {
+      const result = parseCommand(cmd({ id: '1', action: 'launch', allowFileAccess: true }));
+      expect(result.success).toBe(true);
+      if (result.success) {
+        expect(result.command.allowFileAccess).toBe(true);
+      }
+    });
+
+    it('should parse launch with allowFileAccess false', () => {
+      const result = parseCommand(cmd({ id: '1', action: 'launch', allowFileAccess: false }));
+      expect(result.success).toBe(true);
+      if (result.success) {
+        expect(result.command.allowFileAccess).toBe(false);
+      }
+    });
   });
 
   describe('mouse actions', () => {
@@ -1108,6 +1124,46 @@ describe('parseCommand', () => {
     });
   });
 
+  describe('addscript and addstyle', () => {
+    it('should parse addscript with content', () => {
+      const result = parseCommand(
+        cmd({ id: '1', action: 'addscript', content: 'console.log("hi")' })
+      );
+      expect(result.success).toBe(true);
+    });
+
+    it('should parse addscript with url', () => {
+      const result = parseCommand(
+        cmd({ id: '1', action: 'addscript', url: 'https://example.com/script.js' })
+      );
+      expect(result.success).toBe(true);
+    });
+
+    it('should reject addscript with neither content nor url', () => {
+      const result = parseCommand(cmd({ id: '1', action: 'addscript' }));
+      expect(result.success).toBe(false);
+    });
+
+    it('should parse addstyle with content', () => {
+      const result = parseCommand(
+        cmd({ id: '1', action: 'addstyle', content: 'body { color: red }' })
+      );
+      expect(result.success).toBe(true);
+    });
+
+    it('should parse addstyle with url', () => {
+      const result = parseCommand(
+        cmd({ id: '1', action: 'addstyle', url: 'https://example.com/style.css' })
+      );
+      expect(result.success).toBe(true);
+    });
+
+    it('should reject addstyle with neither content nor url', () => {
+      const result = parseCommand(cmd({ id: '1', action: 'addstyle' }));
+      expect(result.success).toBe(false);
+    });
+  });
+
   describe('invalid commands', () => {
     it('should reject unknown action', () => {
       const result = parseCommand(cmd({ id: '1', action: 'unknown' }));