fix(review): escape fix handoff paths

src/review/fix-handoff-render.ts

@@ -33,13 +33,25 @@ export type FixHandoffBlock = {
  *  parse fix-handoff blocks in a comment body without depending on markdown structure alone. */
 const FIX_HANDOFF_MARKER = "<!-- gittensory:fix-handoff -->";
 
+/** Public-safe inline-code escaping for a finding path/location. GitHub comments still render markdown inside
+ *  collapsibles, so neutralize delimiters that can break out of the `...` span or table-like contexts before
+ *  composing the location label. */
+function markdownPathCodeText(value: string): string {
+  return value
+    .replace(/\\/g, "\\\\")
+    .replace(/`/g, "\\`")
+    .replace(/\|/g, "\\|")
+    .replace(/[<>]/g, (char) => (char === "<" ? "&lt;" : "&gt;"));
+}
+
 /** PURE: build a single finding's fix-handoff block. Never throws; a finding whose `line` is not a positive
  *  integer (0, negative, non-finite — i.e. "no commentable line") still yields a valid PATH-ONLY block rather
  *  than being dropped, since the finding itself is still actionable context even without a line anchor. */
 export function buildFixHandoffBlock(finding: InlineFinding): FixHandoffBlock {
   const hasLine = Number.isInteger(finding.line) && finding.line > 0;
   const line = hasLine ? finding.line : 0;
-  const location = hasLine ? `${finding.path}:${line}` : `${finding.path} (no specific line)`;
+  const safePath = markdownPathCodeText(finding.path);
+  const location = hasLine ? `${safePath}:${line}` : `${safePath} (no specific line)`;
   const label = finding.severity === "blocker" ? "Blocker" : "Nit";
   const suggestedChange = finding.suggestion?.trim() || undefined;
   const suggestionBlock = suggestedChange ? `\n\nSuggested change:\n\`\`\`\n${suggestedChange}\n\`\`\`` : "";

test/unit/fix-handoff-collapsible.test.ts

@@ -44,6 +44,21 @@ describe("buildFixHandoffCollapsible (#1962)", () => {
     expect(c?.body).toContain("`src/b.ts (no specific line)`");
   });
 
+  it("escapes adversarial paths before rendering inline-code locations", () => {
+    const [block] = buildFixHandoffBlocks([
+      {
+        path: "src/x` [Review required](https://evil.example/phish) | <tag>",
+        line: 7,
+        severity: "blocker",
+        body: "Check the suspicious path rendering.",
+      },
+    ]);
+
+    expect(block?.path).toBe("src/x` [Review required](https://evil.example/phish) | <tag>");
+    expect(block?.body).toContain("`src/x\\` [Review required](https://evil.example/phish) \\| &lt;tag&gt;:7`");
+    expect(block?.body).not.toContain("`src/x` [Review required](https://evil.example/phish) | <tag>:7`");
+  });
+
   it("carries the no-server-side-write local-execution boundary on every block", () => {
     expect(buildFixHandoffCollapsible(blocks)?.body).toContain(LOCAL_WRITE_BOUNDARY);
   });