fix(domains): stop fill_form misreporting select-by-label, let it fail

Three review fixes on the restored fill_form:

- FILL_FN matches a <select> option by value, label or text but returns
  el.value, so filling by visible label ("Canada" -> value "ca") tripped
  the read-back mismatch check and reported a correctly-set field as
  "Filled 0/1 fields; issues: ref e4 (value mismatch)". The mismatch test
  now also accepts res.text, which FILL_FN sets only for selects, so
  mismatch detection is preserved for every other field kind.
- fill_form always returned ok(), so total failure surfaced as a
  successful result reading "Filled 0/4 fields". It now returns
  invalid_state when okCount is 0, carrying the per-field issue list as
  the error message. Partial success stays ok().
- Removed the two comment blocks this task had added to
  test/manual/forms-test.ts.

Neither behaviour fix has automated coverage; the manual suite that would
exercise them still needs a live Chrome and was not run.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/domains/form-batch.ts b/src/domains/form-batch.ts
index b926025..c4b4df6 100644
--- a/src/domains/form-batch.ts
+++ b/src/domains/form-batch.ts
@@ -1,5 +1,5 @@
 import { Type } from "typebox";
-import { type Result, ok } from "../util/result";
+import { type Result, err, ok } from "../util/result";
 import { defineBrowserTool, type ToolErr, type ToolOk } from "../util/tool";
 import { detailsOf, resolveAndCall } from "./form";
 
@@ -99,7 +99,7 @@ export const fillFormTool = defineBrowserTool({
       const res = r.data;
       const wanted = typeof f.value === "boolean" ? undefined : String(f.value);
       const got = res.value !== undefined ? String(res.value) : undefined;
-      const mismatch = wanted !== undefined && got !== undefined && got !== wanted;
+      const mismatch = wanted !== undefined && got !== undefined && got !== wanted && res.text !== wanted;
       const fieldOk = res.ok === true && !mismatch;
       if (fieldOk) okCount++;
       else issues.push(`ref ${f.ref} (${res.ok === false ? (res.reason ?? "failed") : "value mismatch"})`);
@@ -108,6 +108,9 @@ export const fillFormTool = defineBrowserTool({
     const text =
       `Filled ${okCount}/${args.fields.length} fields` +
       (issues.length > 0 ? `; issues: ${issues.join(", ")}` : "");
+    if (okCount === 0) {
+      return err({ kind: "invalid_state", message: text, details: { results } });
+    }
     return ok({ text, details: { results } });
   },
 });