fix(followups): F4b - bash integer knobs that reach [ -ge/-le/-gt ] or sleep go through mam_int_knob

A non-numeric MAM_READY_EMPTY_GIVEUP, SKS_EMPTY_GIVEUP, SKS_IDLE_RETRIES,
SKS_IDLE_RETRY_BACKOFF_S, MAM_LOCK_STEAL_RETRIES, MAM_DIFF_MAX_BYTES,
MAM_DIFF_MAX_LINES or RECONCILE_POLL_INTERVAL was a `[` error or a sleep
error at the point of use (PR #43 review claude R3). They now go through
mam_int_knob: decimal, a warning and the default for a bad value. Minimums
are in test_issue26_ints.py INT_KNOBS: 1 for the give-up counts (0 acts as
1), the diff caps (0 truncates every diff) and the poll interval (0 is a
busy loop); 0 for the retry counts (one attempt) and the retry backoff.

SKS_QUIESCENT_INTERVAL stays raw: its default is 0.5 s and sleep's
fraction is its meaning; NOT_ARITHMETIC says so.

loop_lock.sh and diff_collect.sh also run without lib.sh (the Python runner
and the tests source them alone), so mam_int / mam_int_knob move verbatim
to lib_int.sh, which lib.sh sources and those two source when the function
is missing. remove.sh's no-manifest fallback list names the new file
(install copies every file under .agents/skills). test_issue21_loop_b l15,
which builds a control root holding only diff_collect.sh, copies it too.

Tests: the table guard now reads every shell file; scripts sourced alone
read their knobs as decimal; _pane_quiescent with SKS_EMPTY_GIVEUP=abc
gives up with a warning and no `[` error (14 of the new cases fail at
0051fd6).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HCGpJXhSZasJLU38ksDghe

.agents/skills/multi-agent-mux-loop/scripts/loop_lock.sh

@@ -2,7 +2,10 @@
 # loop_lock.sh — Atomic race-free loop lock acquisition and marker ownership (O-2)
 # Manages .mam/loop-guard-active with atomic hard links and pid+lstart identity validation.
 
-MAM_LOCK_STEAL_RETRIES="${MAM_LOCK_STEAL_RETRIES:-3}"
+# This file is also sourced without lib.sh (tests); the integer rule is lib_int.sh's.
+# shellcheck source=../../lib_int.sh
+declare -F mam_int_knob >/dev/null || source "$(dirname "${BASH_SOURCE[0]}")/../../lib_int.sh"
+MAM_LOCK_STEAL_RETRIES="$(mam_int_knob MAM_LOCK_STEAL_RETRIES 3 0)"
 
 mam_lstart() {
   local pid="${1:-$$}"