refactor(issue-17): item 4 - the delegate-job wrapper's decisions move to Python

The wrapper keeps spawn / wait / kill, key injection and the herdr
diagnostic probe; what it decided in bash is now lib_py/delegation/wrapper.py,
reached through one `_decide` helper:

- finalize_unfinished: the clock choice, the disk grace and broker
  re-observation, the close request / label, the close and the event
  (finalize-begin / finalize-end; bash runs only the busy probe between them)
- start_stall_watch: whether to watch (MAM_STALL_WATCH, remote, human)
- _map_sub_rc, _rc_for (+ MAM_DELEGATE_FAIL_CLOSED), the subscriber
  early-exit check and cmd_wait's rc normalisation
- mam_int / mam_int_knob run lib_py/ints.py, which is also the runner's
  _positive_int: one implementation of the Issue #26 rule

No behaviour change: tests/test_issue17_item4_decisions.py runs the old
bash functions (copied verbatim from 7209750) and the new wrapper on the
same inputs and compares output, FINAL_JOB_STATUS and the registry /
publish calls. Three static tests that pinned the old bash literals now
pin the Python entry points instead.

Refs #17

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib_py/loop/runner.py

@@ -25,6 +25,7 @@ import time
 from pathlib import Path
 from typing import Any, Dict, List, Optional, Set, Tuple
 
+from lib_py import ints
 from lib_py.delegation import registry as job_registry
 from lib_py.loop import checkpoint, eager, parser
 
@@ -68,17 +69,8 @@ def log_error(msg: str) -> None:
 
 
 
-def _positive_int(text: Optional[str], minimum: int = 1) -> Optional[int]:
-    """Issue #26: lib.sh mam_int's rule - blanks around, digits only, decimal
-    (0700 is 700), minimum <= n <= 999999999; else None."""
-    s = (text or "").strip(" \t\n\r\v\f")
-    if not s or not s.isascii() or not s.isdigit():
-        return None
-    s = s.lstrip("0") or "0"
-    if len(s) > 9:  # like mam_int: bounded before int(), which refuses > 4300 digits
-        return None
-    n = int(s)
-    return n if n >= minimum else None
+# Issue #17 item 4: lib.sh mam_int's rule, one implementation (lib_py/ints.py).
+_positive_int = ints.positive_int
 
 class LoopRunner:
     """Orchestrates planning, code implementation, and multi-agent peer reviews."""