diff --git a/apps/api/src/services/p0_cicd_baseline_source_readiness.py b/apps/api/src/services/p0_cicd_baseline_source_readiness.py
index fc7f4542..45a7f67f 100644
--- a/apps/api/src/services/p0_cicd_baseline_source_readiness.py
+++ b/apps/api/src/services/p0_cicd_baseline_source_readiness.py
@@ -45,7 +45,7 @@ def _enrich_source_presence(payload: dict[str, Any], repo_root: Path) -> None:
     for source in required_sources:
         item = _dict(source)
         relative_path = str(item.get("path") or "")
-        present = bool(relative_path) and (repo_root / relative_path).is_file()
+        present = bool(relative_path) and _source_present(repo_root, relative_path)
         item["present"] = present
         if present:
             present_ids.append(str(item.get("id") or relative_path))
@@ -72,6 +72,18 @@ def _enrich_source_presence(payload: dict[str, Any], repo_root: Path) -> None:
     )
 
 
+def _source_present(repo_root: Path, relative_path: str) -> bool:
+    if (repo_root / relative_path).is_file():
+        return True
+
+    api_prefix = "apps/api/"
+    if relative_path.startswith(api_prefix):
+        runtime_relative_path = relative_path.removeprefix(api_prefix)
+        return (repo_root / runtime_relative_path).is_file()
+
+    return False
+
+
 def _require_schema(payload: dict[str, Any], label: str) -> None:
     actual = payload.get("schema_version")
     if actual != _SCHEMA_VERSION:
diff --git a/apps/api/tests/test_p0_cicd_baseline_source_readiness_api.py b/apps/api/tests/test_p0_cicd_baseline_source_readiness_api.py
index 4000718f..97596cb1 100644
--- a/apps/api/tests/test_p0_cicd_baseline_source_readiness_api.py
+++ b/apps/api/tests/test_p0_cicd_baseline_source_readiness_api.py
@@ -1,5 +1,8 @@
 from __future__ import annotations
 
+import json
+from pathlib import Path
+
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 
@@ -32,6 +35,14 @@ from src.services.p0_cicd_baseline_source_readiness import (
     load_latest_p0_cicd_baseline_source_readiness,
 )
 
+_REPO_ROOT = Path(__file__).resolve().parents[3]
+_SNAPSHOT_PATH = (
+    _REPO_ROOT
+    / "docs"
+    / "operations"
+    / "p0-cicd-baseline-source-readiness.snapshot.json"
+)
+
 
 def test_p0_cicd_baseline_source_readiness_loader_reports_ready_sources():
     payload = load_latest_p0_cicd_baseline_source_readiness()
@@ -53,6 +64,34 @@ def test_p0_cicd_baseline_source_readiness_loader_reports_ready_sources():
     assert payload["operation_boundaries"]["secret_read_allowed"] is False
 
 
+def test_p0_cicd_baseline_source_readiness_supports_runtime_image_layout(tmp_path):
+    operations_dir = tmp_path / "docs" / "operations"
+    operations_dir.mkdir(parents=True)
+    payload = json.loads(_SNAPSHOT_PATH.read_text(encoding="utf-8"))
+    (operations_dir / _SNAPSHOT_PATH.name).write_text(
+        json.dumps(payload),
+        encoding="utf-8",
+    )
+
+    for source in payload["required_sources"]:
+        relative_path = source["path"]
+        if relative_path.startswith("apps/api/"):
+            runtime_path = tmp_path / relative_path.removeprefix("apps/api/")
+            runtime_path.parent.mkdir(parents=True, exist_ok=True)
+            runtime_path.write_text("# runtime image source\n", encoding="utf-8")
+        else:
+            repo_path = tmp_path / relative_path
+            repo_path.parent.mkdir(parents=True, exist_ok=True)
+            repo_path.write_text("{}", encoding="utf-8")
+
+    data = load_latest_p0_cicd_baseline_source_readiness(operations_dir)
+
+    assert data["status"] == "ready_for_template_copy_apply_gate"
+    assert data["rollups"]["present_required_source_count"] == 11
+    assert data["rollups"]["missing_required_source_count"] == 0
+    assert data["rollups"]["blocked_source_ids"] == []
+
+
 def test_recreated_onboarding_sources_keep_apply_gates_closed():
     response = {
         "accept_warning_only_scope": True,
diff --git a/docs/LOGBOOK.md b/docs/LOGBOOK.md
index f32c18f3..017da625 100644
--- a/docs/LOGBOOK.md
+++ b/docs/LOGBOOK.md
@@ -1,3 +1,18 @@
+## 2026-06-29 — 13:22 P0-004 source readiness production layout readback 修正
+
+**完成內容**：
+- `cd.yaml #3879` / `d128f298` 已讀回 `Success`，deploy marker `5920c95ad chore(cd): deploy d128f29 [skip ci]` 已進 Gitea main。
+- Production health 為 `healthy`，但 `/api/v1/agents/p0-cicd-baseline-source-readiness` 仍讀回 `present=3`、`missing=8`。
+- 定位原因：production API image 使用 `/app/src/services/...` layout；P0 source readiness snapshot 記錄的是 repo layout `apps/api/src/services/...`，loader 未映射 production image path。
+- `p0_cicd_baseline_source_readiness` 新增 runtime image path fallback：`apps/api/<path>` 不存在時，改查 production image 的 `<path>`。
+- 測試新增 tmp-path production layout 模擬，確認 source readiness 在 runtime image layout 下仍為 `11/11`、`100%`。
+
+**驗證目標**：
+- `DATABASE_URL=sqlite:///test.db PYTHONPATH=apps/api python3.11 -m pytest apps/api/tests/test_p0_cicd_baseline_source_readiness_api.py apps/api/tests/test_delivery_closure_workbench_api.py -q`。
+- `python3.11 -m py_compile apps/api/src/services/p0_cicd_baseline_source_readiness.py`、`git diff --check`。
+
+**邊界**：只修 readback path mapping；未 workflow_dispatch；未讀 token / `.runner` / cookie / session / secret / auth / `.env`；未操作 host / Docker / K8s / DB；workflow modification / trigger gate 維持 false。
+
 ## 2026-06-29 — 13:05 P0-002 product.awoooi.yaml manifest standard readiness
 
 **完成內容**：