xtask/tests/cli.rs: the all-gates selftest case asserts the dispatcher reached a verdict

[MattJackson]

The shared red: gate:test:workspace ... (nextest: xtask::cli::selftest_runs_every_registered_gates_red_proof)

xtask/tests/cli.rs::selftest_runs_every_registered_gates_red_proof required xtask selftest over EVERY registered gate to exit 0. Each gate's red proof is planted over the tree the test runs in. When a gate is already red on that tree, its selftest reports "THE PROOF IS IMPOSSIBLE — the rows this case covers were ALREADY RED on the unplanted tree". So this one nextest case goes red on every branch that reds any gate at all, under one shared name. The test:xtask-selftest check already reports that same failure, and it names the gate:

PR	gate whose selftest is impossible on the branch
#502	plane-abi-neutrality
#648	unconstructed
#634, #673, #703	linked-dropped-features (unified-deps red on the branch)
#621	settings-leak (scan-floor)
#627	no-deferral (discovery floor)
#629	tracing (scan-floor 971 < 980)

The case's subject is the DISPATCHER (the file header says so). It now holds the all-gates arm to 0 or 1, the same way gate --all is held two cases above it, because 2 (bad arguments) and 3 (could not run) are the answers that mean the arm never judged. It keeps selftest segregation and gate segregation --selftest at 0. Each gate's proof is still judged gate by gate in test:xtask-selftest.

This removes one duplicate deny line, and about 480 s of nextest, from every branch with a red gate. It does not make any of those branches green, because each one still owes its own gate.

[github-actions]

promote into predev: BOARD @6aad3f5ae: 0 failing test row(s), 11 DENY row(s)

DENY rows (11)

gate	row	detail
construction	one-pick-site	3 production call site(s) of 'pick_among(' (ceiling 2): crates/busbar-kernel-egress/src/walk.rs:298; crates/busbar-llm/src/engine/exhaustion/fallback.rs:120; crates/busbar-llm/src/engine/pipeline.rs:8
kind-isolation	kind-isolation:deps	3 finding(s), 94 shipped edge instance(s) over 31 class(es), 94 declaration(s); 57 '[[dep]]' row(s), 0 question(s): unlisted-dep-edge legacy -> plane busbar-llm -> busbar-plane-llm is a shipped edge w
kind-isolation	kind-isolation:test-deps	3 finding(s), 35 test edge instance(s) over 21 class(es), 35 declaration(s); 20 '[[dep]]' row(s), 0 question(s): unlisted-dep-edge cleanliness -> legacy busbar-core-admin -> busbar-a2a is a test edge
kind-isolation	kind-isolation:law0	18 finding(s) over 14 neutral crate(s): law0-rise busbar × auth 51 hit(s) against a ceiling of 46: this landing grew a neutral crate's instance vocabulary. Ceilings only fall (measured on predev f830f
kind-isolation-ship	kind-isolation:deps	11 finding(s) over 94 shipped edge(s): ship-edge kernel -> hooks busbar-kernel -> busbar-hook-ranking is 'not-allowed': the architecture grants no kernel -> hooks edge, and the ship criterion is the a
kind-isolation-ship	kind-isolation:test-deps	10 finding(s) over 35 test edge(s): ship-edge cleanliness -> export busbar-core-admin -> busbar-export-prometheus is 'not-allowed': the architecture grants no cleanliness -> export edge, and the ship
kind-isolation-ship	kind-isolation:law0	18 finding(s) over 14 neutral crate(s): law0-rise busbar × auth 51 hit(s) against a ceiling of 46: this landing grew a neutral crate's instance vocabulary. Ceilings only fall (measured on predev f830f
kind-isolation-ship	kind-isolation:faces	2 finding(s) over 40 crate(s): foreign-entry crates/busbar busbar is kind 'root' and implements 'Transport' 1 time(s) in shipped source — the entry face of kind 'transport'. A trait implementation is
kind-isolation-ship	kind-isolation:legacy-drain	3 finding(s): transitional-live qa/kind-isolation.toml 'busbar-a2a -> busbar-core-admin' (legacy drain: the retiring A2A engine's tests drive the admin surface that drained into the cleanliness tier)
ship-ready	ship-ready:ship-twin	'kind-isolation-ship' is not green: kind-isolation:deps (a dependency the architecture does not grant is still in the graph); kind-isolation:test-deps (a dependency the architecture does not grant is
structure-lint	structure-lint:plane-dup:unledgered	22 finding(s): PLANE-DUPLICATE (module): 'config.rs' — a2a:crates/busbar-a2a/src/a2a/config.rs decisions:crates/busbar-plane-decisions/src/config.rs voice:crates/busbar-voice/src/config.rs (the ledger

Judged against base 6ca8584fc: 0 new red, 0 worse, 5 standing (excused).

tests passed: 11373, failed: 0. Run: https://github.com/GetBusbar/busbar/actions/runs/38028993350 . Artifact verdict-6aad3f5ae648757cb228884c5c8870f8c93fb225 (failures.json, junit.xml, raw.log; 90 days).