fix(qg): find 14-deploy-log.md in origin/main when absent in feature worktree

ET-013: deployer writes 14-deploy-log.md and merges deploy artifacts into
main via a separate PR, so the log lands in origin/main, not the feature
branch worktree that check_deploy_status reads via _repo_path(repo, branch).
Result: every successful deploy was falsely failed (Deploy log not found)
and rolled back deploy->development.

Fix: when the log is absent in the worktree, fall back to reading it from
origin/main on the shared clone (git fetch origin main + git show
origin/main:docs/work-items/<WI>/14-deploy-log.md). Lookup order:
worktree -> origin/main -> not found. Fetch/show failures degrade to
not found (never raise). Does not touch the merge-gate in gitea.py.

Tests: origin/main SUCCESS->PASS (ET-013 case), origin/main FAILED->FAILED,
absent everywhere->not found, fetch failure->degrades no exception,
worktree log short-circuits main lookup.

src/qg/checks.py

@@ -2,6 +2,7 @@
 
 import os
 import logging
+import subprocess
 import httpx
 from ..config import settings
 
@@ -281,6 +282,64 @@ def check_tests_local(repo: str, branch: str) -> tuple[bool, str]:
         return False, f"Local test run error: {e}"
 
 
+def _parse_deploy_status(content: str) -> tuple[bool, str]:
+    """Parse a 14-deploy-log.md body and map its `deploy_status:` frontmatter to a
+    quality-gate verdict. Reads ONLY the machine-readable YAML field, never prose.
+
+      deploy_status: SUCCESS -> (True,  "Deploy status: SUCCESS")
+      deploy_status: FAILED  -> (False, "Deploy status: FAILED")
+      missing field / no frontmatter / bad YAML -> (False, <reason>)
+    """
+    import yaml
+    status = None
+    if content.startswith("---"):
+        parts = content.split("---", 2)
+        if len(parts) >= 3:
+            try:
+                fm = yaml.safe_load(parts[1]) or {}
+            except yaml.YAMLError as e:
+                return False, f"Invalid YAML frontmatter in deploy log: {e}"
+            status = str(fm.get("deploy_status", "")).upper().strip()
+    if status == "SUCCESS":
+        return True, "Deploy status: SUCCESS"
+    if status == "FAILED":
+        return False, "Deploy status: FAILED"
+    return False, f"No machine-readable deploy_status in frontmatter (got: {status!r})"
+
+
+def _deploy_log_from_main(repo: str, work_item_id: str) -> str | None:
+    """Best-effort read of 14-deploy-log.md from origin/main on the shared clone.
+
+    The deployer writes 14-deploy-log.md and merges the deploy artifacts into main
+    via a separate PR (see ET-013), so the file lands in origin/main, NOT in the
+    feature branch worktree the gate normally reads. This recovers it from main.
+
+    Degrades gracefully: any git failure (no clone, network/fetch error, file
+    absent in main) returns None instead of raising, so the caller falls back to
+    the plain "not found" verdict. Never raises.
+    """
+    repo_clone = os.path.join(settings.repos_dir, repo)
+    if not os.path.isdir(os.path.join(repo_clone, ".git")):
+        return None
+    rel = f"docs/work-items/{work_item_id}/14-deploy-log.md"
+    try:
+        # Refresh origin/main so we see freshly-merged deploy artifacts.
+        subprocess.run(
+            ["git", "-C", repo_clone, "fetch", "origin", "main"],
+            check=False, capture_output=True, timeout=30,
+        )
+        show = subprocess.run(
+            ["git", "-C", repo_clone, "show", f"origin/main:{rel}"],
+            check=False, capture_output=True, text=True, timeout=15,
+        )
+    except (subprocess.SubprocessError, OSError) as e:
+        logger.warning("deploy-log origin/main lookup failed for %s/%s: %s", repo, work_item_id, e)
+        return None
+    if show.returncode != 0:
+        return None
+    return show.stdout
+
+
 def check_deploy_status(repo: str, work_item_id: str, branch: str | None = None) -> tuple[bool, str]:
     """
     БАГ 8 fix: gate the deploy -> done transition on the deployer's machine-readable
@@ -291,32 +350,30 @@ def check_deploy_status(repo: str, work_item_id: str, branch: str | None = None)
     frontmatter. Returns:
       (True, ...)  -> deploy_status: SUCCESS
       (False, ...) -> deploy_status: FAILED, missing field, or no frontmatter
+
+    ET-013 path-sync fix: the deployer writes 14-deploy-log.md and merges the deploy
+    artifacts into main via a SEPARATE PR, so the log lands in origin/main, not in
+    the feature-branch worktree this gate reads via _repo_path(repo, branch). If the
+    file is absent in the worktree we fall back to reading it from origin/main on the
+    shared clone. Lookup order: worktree -> origin/main -> not found.
     """
-    import yaml
     repo_path = _repo_path(repo, branch)
     log_path = os.path.join(repo_path, f"docs/work-items/{work_item_id}/14-deploy-log.md")
 
-    if not os.path.isfile(log_path):
-        return False, "Deploy log not found (14-deploy-log.md)"
-    try:
-        with open(log_path, "r") as f:
-            content = f.read()
-        status = None
-        if content.startswith("---"):
-            parts = content.split("---", 2)
-            if len(parts) >= 3:
-                try:
-                    fm = yaml.safe_load(parts[1]) or {}
-                except yaml.YAMLError as e:
-                    return False, f"Invalid YAML frontmatter in deploy log: {e}"
-                status = str(fm.get("deploy_status", "")).upper().strip()
-        if status == "SUCCESS":
-            return True, "Deploy status: SUCCESS"
-        if status == "FAILED":
-            return False, "Deploy status: FAILED"
-        return False, f"No machine-readable deploy_status in frontmatter (got: {status!r})"
-    except OSError as e:
-        return False, f"Error reading deploy log: {e}"
+    if os.path.isfile(log_path):
+        try:
+            with open(log_path, "r") as f:
+                content = f.read()
+        except OSError as e:
+            return False, f"Error reading deploy log: {e}"
+        return _parse_deploy_status(content)
+
+    # Not in the feature worktree — the deployer may have merged it into main.
+    main_content = _deploy_log_from_main(repo, work_item_id)
+    if main_content is not None:
+        return _parse_deploy_status(main_content)
+
+    return False, "Deploy log not found (14-deploy-log.md)"
 
 
 # Registry for dynamic lookup by name