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/pool/pipeline/merge/runner.rs

@@ -186,50 +186,6 @@ impl AgentPool {
                         .map(|k| k.is_self_evident_fix())
                         .unwrap_or(false);
 
-                // Bug 1101 diagnostic: log the classified failure_kind and the
-                // matched classifier-trigger substring with surrounding context,
-                // so we can confirm whether classify() is incorrectly matching
-                // a passing-step stdout substring (e.g. "Diff in " inside a
-                // failing test's panic message) and bouncing the story to a
-                // fixup coder. Remove once the fix lands.
-                if let Ok(r) = report.as_ref()
-                    && let crate::agents::merge::MergeResult::GateFailure {
-                        output: gate_output,
-                        failure_kind: Some(k),
-                    } = &r.result
-                {
-                    const TRIGGERS: &[&str] = &[
-                        "CONFLICT (content):",
-                        "Merge conflict:",
-                        "Diff in ",
-                        "would reformat",
-                        "missing-docs direction",
-                        "error[clippy::",
-                        "warning[clippy::",
-                        "missing_doc_comments",
-                        "error[E",
-                    ];
-                    let matched = TRIGGERS
-                        .iter()
-                        .find_map(|t| gate_output.find(t).map(|i| (*t, i)));
-                    let (trigger, context) = match matched {
-                        Some((t, i)) => {
-                            let start = i.saturating_sub(30);
-                            let end = (i + t.len() + 60).min(gate_output.len());
-                            let ctx = gate_output
-                                .get(start..end)
-                                .unwrap_or("<context unavailable>")
-                                .replace('\n', " ");
-                            (Some(t), ctx)
-                        }
-                        None => (None, String::from("<no trigger matched>")),
-                    };
-                    slog!(
-                        "[merge] classify diagnostic for '{sid}': failure_kind={k:?} \
-                         is_fixup={is_fixup} trigger={trigger:?} context='{context}'"
-                    );
-                }
-
                 if is_no_commits {
                     let reason = kind.display_reason();
                     if let Err(e) = crate::agents::lifecycle::transition_to_blocked(&sid, &reason) {