Session log: J2J-2 watermark-to-counter migration, J2J-3 SDP-aware deployment fixes, Mac compatibility review.
Adds ai_dev_support/SESSION_2026-09-13_j2j_jobs_and_watermark_counter.md
documenting today's session: fixed tools/j2j_jobs_report.sh's stale
dev_env.sh reference (change 33765); J2J-2 watermark moved from a local
file to a P4 server counter (change 33766) plus a missed version-bump
correction (33767); J2J-3 SDP-aware/not-SDP-dependent deployment fixes
(change 33768, including a changelist-description correction via
'p4 change -u'); and a live Mac-compatibility verification (dry-run test
from this checkout, no code changes).