fix: pass-2 review fixes

A test edit routes as tests= only when it adds lines with no gate tag; a removed or changed line or an unreadable test diff goes through the full loop. Diffs skip textconv. A hunkless patch (binary, empty, mode-only) is same when its patch-id matches. Without --reviewed-base test files route as before. finish's packet path and attempt's state directory have fallbacks.

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

bin/gstack-docs-candidate

@@ -185,6 +185,7 @@ function main(argv: string[]): void {
       console.log(`STOP: run the install fix (${install}) and confirm its gstack: ok trailer before another launch`);
       process.exit(3);
     }
+    fs.mkdirSync(path.dirname(path.resolve(state)), { recursive: true });
     fs.writeFileSync(state, JSON.stringify({ not_counted: seen + 1 }) + '\n', { mode: 0o600 });
     console.log(`ATTEMPT: not-counted (install refused: ${install})`);
     return;