fix(completion): resolve 4x failures by finding jobs in archive directories and patching proof test fixture

bin/followup-sweeper.py

@@ -175,13 +175,27 @@ def fallback_due(rec, now=None):
 _EXEC_OPS_MOD = None
 
 
+def find_job_file(job_name):
+    """Locate a job definition in JOBS_DIR or any archive subdirectory."""
+    p = JOBS_DIR / f"{job_name}.json"
+    if p.exists():
+        return p
+    for match in JOBS_DIR.glob(f"archive/**/{job_name}.json"):
+        if match.is_file():
+            return match
+    for match in JOBS_DIR.glob(f"**/archive/**/{job_name}.json"):
+        if match.is_file():
+            return match
+    return None
+
+
 def derive_job_name(job_id):
     """Extract the job name from a dispatched job_id (<name>-YYYYMMDD-HHMMSS-<hex8>)."""
     m = _JOB_ID_RE.match(job_id or "")
     if not m:
         return None
     name = m.group(1)
-    if not (JOBS_DIR / f"{name}.json").exists():
+    if not find_job_file(name):
         return None
     return name
 
@@ -193,8 +207,11 @@ def load_job_fallback(job_name):
       {"job": "<job-name>"}             -> dispatch a fallback job, or
       {"op": "<exec-op>", "args": {...}} -> run one exec-constrained op.
     """
+    job_path = find_job_file(job_name)
+    if not job_path:
+        return None, f"unreadable job {job_name}: [Errno 2] No such file or directory: '{JOBS_DIR / (job_name + '.json')}'"
     try:
-        with open(JOBS_DIR / f"{job_name}.json", "r", encoding="utf-8") as f:
+        with open(job_path, "r", encoding="utf-8") as f:
             cfg = json.load(f)
     except Exception as e:
         return None, f"unreadable job {job_name}: {e}"
@@ -209,7 +226,7 @@ def load_job_fallback(job_name):
         jn = spec["job"]
         if not isinstance(jn, str) or not _JOB_NAME_RE.fullmatch(jn):
             return None, "on_no_result.job must be a valid job name"
-        if not (JOBS_DIR / f"{jn}.json").exists():
+        if not find_job_file(jn):
             return None, f"on_no_result.job {jn!r} does not exist"
     else:
         if not isinstance(spec.get("op"), str) or not _OP_NAME_RE.fullmatch(spec["op"]):