feat(eval): memoir A/B chapter judging and eval-web parity with dialogue

- Judge baseline excerpt and library chapter separately; build_memoir_compare_summary for gate, nine-dim and leaf deltas.

- Memoir SSE chapter payload: baseline_judge, compare_summary, baseline_judge_error.

- MemoirJudgeOutput: loose score coercion and post-validate clamp; memoir judge prompt caps from settings.

- app-eval-web: two-column MemoirScoreCard layout, MemoirCompareSummary, chapter blocks and CSS.

- Add memoir_compare_summary, log_events, celery_log_context, memoir_pipeline_progress; tests and migration 0014.

- Misc: memory/evidence and enrichment paths, task/orchestrator updates, internal-eval docs, env examples.

api/tests/test_log_events.py

@@ -0,0 +1,62 @@
+"""log_events：format_log_event 与 celery_prerun_extras。"""
+
+from __future__ import annotations
+
+from app.core.log_events import (
+    celery_prerun_extras,
+    correlation_bind_kwargs,
+    format_log_event,
+)
+
+
+def test_format_log_event_msg_last() -> None:
+    s = format_log_event(
+        "demo",
+        z_last=1,
+        a_first="x",
+        msg="你好 世界",
+    )
+    assert s.startswith("event=demo ")
+    assert s.endswith(" msg=你好 世界")
+    assert "a_first=x" in s
+    assert "z_last=1" in s
+
+
+def test_format_log_event_skips_empty() -> None:
+    s = format_log_event("x", empty="", none_val=None, ok=5)
+    assert "empty=" not in s
+    assert "none_val=" not in s
+    assert "ok=5" in s
+
+
+def test_format_log_event_float() -> None:
+    s = format_log_event("t", duration_ms=12.3456)
+    assert "duration_ms=12.3" in s
+
+
+def test_correlation_bind_kwargs() -> None:
+    d = correlation_bind_kwargs(
+        user_id="u1",
+        memoir_correlation_id="c1",
+    )
+    assert d == {"user_id": "u1", "correlation_id": "c1"}
+
+
+def test_celery_prerun_extras_from_kwargs() -> None:
+    ex = celery_prerun_extras(
+        "app.tasks.memory_enrichment_tasks.enrich_memory_source",
+        ("uid", "sid"),
+        {"memoir_correlation_id": "mc"},
+    )
+    assert ex["user_id"] == "uid"
+    assert ex["source_id"] == "sid"
+    assert ex["correlation_id"] == "mc"
+
+
+def test_celery_prerun_extras_positional_only() -> None:
+    ex = celery_prerun_extras(
+        "app.tasks.chapter_compose_tasks.recompose_chapter",
+        ("chap-1",),
+        {},
+    )
+    assert ex == {"chapter_id": "chap-1"}