JSQUE-020 — drop the job queue, dispatch by plain recursion

Retire the .be/queue ULOG dispatch (core/job.js + core/loop.js + core/barrier.js) in favour of the in-process recursion the read views already use (core/recurse.js). The queue was JSQUE-001/002/003/006; this reverses that where recursion is strictly simpler.

Input

Context

Read views (status, diff, ls, …) already dispatch WITHOUT the queue via core/recurse.js — a synchronous depth-first walk (JAB-004/014). Only get + post touch the queue's barrier.
Only two verbs require("core/barrier.js"): verbs/post/post.js and verbs/get/get.js. Every other "barrier" mention (delete preflight, status "no barrier") is unrelated; the .fold( in get/patch/weave is weave.fold, a different primitive.
post's barrier is a SINGLE-PASS ceremony, no fan-out: it already holds the whole decision set in memory (dres.decisions) and builds the tree from it (commitM.buildTree(dres.decisions)); the barrier.fold callback is just acc.count++ and its ONLY consumer is a cross-check (POSTFOLD: range mismatch) — tautological once in memory (post.js:569-600).
get's delSweep fold is REPORT-ONLY: it back-scans the queue to tally delete leaves into ctx._get.delSwept, and the code notes JS has no rmdir leaf so the empty-dir collapse is a no-op; the per-path del rows are already the durable effect (get.js:867-888).
What the queue genuinely earns elsewhere: breadth-first order, durable back-scan fold, crash-resume via the .done offset. None of the three is load-bearing for the two folds above.

Goals

Delete core/barrier.js and both call sites: post's commit fold → an in-memory count assert (or drop, since leaves derives from dres.decisions); get's delSweep → an in-memory tally over the fan-out descriptors (or drop if delSwept is never rendered).
Prove FULL parity: the existing test/ golden-snapshot suite stays green with no test edits.
End-goal (LATER phases, not this worker): replace the loop.js queue dispatch itself with recursion, then retire core/job.js.

Constraints

No test edits (meta/work.mkd §4). Start with a characterization run of the current suite as the repro baseline.
Never touch the C beagle/; JS be/ only. Run via jab, never native be.
test/ is a submodule — stage new/changed source with jab put so a jab get recursion cannot sweep it.
Scope THIS worker to the barrier removal only (get + post + core/barrier.js). Queue/loop dispatch removal is a follow-up.

WIP

Design decisions

Barrier folds carry no data the handler lacks in memory, so removal is a substitution, not a re-architecture: replace durable re-read with the already-held array.
Phase the work so each phase lands green independently: (1) barrier, (2) loop dispatch → recursion, (3) delete core/job.js.

TODOs

v Baseline: full suite = 122/122; the parity floor held at every phase.
v post.js: barrier emit+fold → in-memory count assert over dres.decisions; dropped barrierPath/cleanupBarrier/lastFoldOffset.
v get.js: ctx._get.delSwept written but read NOWHERE (flush is ctx._finalize=flushGet), so delSweep dropped to a no-op.
v Deleted core/barrier.js; dropped the orphan seekBack wrapper in shared/ulog.js (barrier was its sole caller).
v Phase 2: loop.js queue → in-memory FIFO _memQueue (same BFS consume-while-append); removed /tmp/PID/resume/.done/subQueuePath; bro re-entry → reentry marker.
v Phase 3: deleted core/job.js; removed orphan feedRows/appendInPlace from ulog.js; one approved fixture edit (pager.py cat sample → core/loop.js).
v Final suite 122/122, orchestrator-verified; only one approved test edit.

Blockers and bummers

Phase 3 was gated by a registered test: test/bro/universal/pager.py cats core/job.js as sample pager content. Retiring the file needed the (user-approved) repoint to cat:core/loop.js.

Outcome

Job queue dropped: core/barrier.js + core/job.js deleted; dispatch is now an in-memory FIFO in core/loop.js over the recursion the read views already use.
Landed 928aaad5 (be trunk, 2026-07-02): "JSQUE-020: phase out the work queue". core/job.js + core/barrier.js gone from be/core/; loop.js is the in-memory dispatcher.