fix(1101): strip passing-test lines before classify() lint check; remove diagnostic

The merge gate classifier was matching trigger keywords like
`missing_doc_comments` inside passing-test name lines
(e.g. `test agents::gates::tests::classify_lint_from_missing_doc_comments ... ok`),
causing every gate failure to be mis-classified as Lint and bounced
back to a fixup coder. Strip `test … … ok` lines before scanning for
lint triggers. Also removes the temporary diagnostic block in
runner.rs that confirmed the bug.

Applied directly to master because the 1101 feature branch carried
stale work from an earlier incarnation of the story that semantically
conflicted with master's later diagnostic commit (`is_fixup` deleted
on the branch, referenced on master).

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

server/src/agents/gates.rs

@@ -33,16 +33,28 @@ impl GateFailureKind {
     /// Called once when a gate fails to produce a typed kind.  Downstream code
     /// matches on the variant and must not call this on subsequent reads.
     pub fn classify(output: &str) -> Self {
+        // Strip `test <name> ... ok` lines before checking lint-trigger keywords so
+        // a passing test whose name contains e.g. `missing_doc_comments` or `clippy::`
+        // does not produce a false-positive Lint classification (story 1101).
+        let stripped_for_lint: String = output
+            .lines()
+            .filter(|l| {
+                let t = l.trim();
+                !(t.starts_with("test ") && t.ends_with("... ok"))
+            })
+            .collect::<Vec<_>>()
+            .join("\n");
+        let is_lint = stripped_for_lint.contains("error[clippy::")
+            || stripped_for_lint.contains("warning[clippy::")
+            || stripped_for_lint.contains("missing_doc_comments");
+
         if output.contains("CONFLICT (content):") || output.contains("Merge conflict:") {
             GateFailureKind::ContentConflict
         } else if output.contains("Diff in ") || output.contains("would reformat") {
             GateFailureKind::Fmt
         } else if output.contains("missing-docs direction") {
             GateFailureKind::SourceMapCheck
-        } else if output.contains("error[clippy::")
-            || output.contains("warning[clippy::")
-            || output.contains("missing_doc_comments")
-        {
+        } else if is_lint {
             GateFailureKind::Lint
         } else if output.contains("error[E") {
             // rustc compile errors (e.g. `error[E0063]: missing field`).
@@ -871,6 +883,19 @@ mod tests {
         );
     }
 
+    /// Story 1101: a passing test whose name contains a lint trigger keyword
+    /// must NOT produce a Lint classification.
+    #[test]
+    fn classify_does_not_false_positive_on_test_name_substring() {
+        let output = "test agents::gates::tests::classify_lint_from_missing_doc_comments ... ok\n\
+             test result: ok. 1 passed; 0 failed";
+        assert_ne!(
+            GateFailureKind::classify(output),
+            GateFailureKind::Lint,
+            "passing test name containing 'missing_doc_comments' must not classify as Lint"
+        );
+    }
+
     #[test]
     fn classify_source_map_check_from_missing_docs_direction() {
         assert_eq!(