STATUS-006: jab status ignores a plain-dir arg and the cwd context — silent whole-wt degrade

Now: OPEN

Input

Context

Reported by gritzko 2026-07-11, repro'd on the journal repo (jab plant journal/be): jab status wiki (and the pager spell :status wiki) emits the WHOLE tree; bare jab status run from ~/src/journal/wiki likewise shows the parent's whole status.

views/status/status.js:114 parses the arg fine (scope="wiki"), argRel+wtpath yield .../journal/wiki — then statusOne (status.js:153) only does be.find(row.uri), which CLIMBS to the nearest shard anchor: a plain dir climbs back to the top repo, whole-wt emit.
Scoping works ONLY when the arg names a mounted SUB (status test → the sub's own shard, DIS-060 comment); a subtree filter below the found repo root was never implemented in jab.
Native parity gap: C be status:<path>/ sub-scope landed in STATUS-001 (bc5c0bd4); jab has no equivalent.
The pager leg is NOT the cause: the footer form status ///wiki parses back to /wiki and wtdir resolves it to journal/wiki correctly (verified); the degrade reproduces on the plain CLI.
Same class in diff (bare :diff ignores the dir context): DIFF-013, fix the shared shape together.

Goals

jab status <dir> (CLI and pager spell) emits only rows under <dir>, keeping the sub-shard redirect for mounted subs.
Bare jab status from a subdir cwd (or a pager context nav'd into one) scopes to that dir — extends the BE-046 "context = cwd" ruling to DIR contexts.
No silent whole-wt degrade (cf. BE-037): a path that exists but has no dirty rows emits an empty/clean hunk, never the whole tree.

Constraints

Repro test first (work); fix in beagle-ext (JS), no C changes.
Keep find()'s sub-shard redirect intact; the residue below the found repo root becomes a row filter.
The verb resolves (context, arg) itself; no pager pre-merge (BE-030/BE-039).
Minimal diff; no edits to unrelated tests.

WIP

Design decisions

Sketch: statusOne keeps the sub-path residue (row.uri minus repo.wt) and threads it as a prefix filter into emitRepo's row emission; recurse only into mounted subs BELOW the filter.
Bare-status cwd scoping: default the filter to the run's context dir (be.ctxDir already rides the run, BE-032 _ctxSub); alternatively the loop edge (BE-048 block, core/loop.js:390) pushes the context DIR as a rooted arg for no-arg views — decide ONE shared mechanism with DIFF-013.

TODOs

repro test: dirty files in two dirs, status <dir> shows only that dir's rows
repro test: bare status from a subdir cwd scopes to that dir
fix: subtree filter in statusOne/emitRepo (+ sub recursion below the filter)
fix: bare-status context-dir default (shared mechanism with DIFF-013)
pager leg verified end-to-end: :status wiki from a journal-root session scopes