missing GUI elements

[A13xB0]

The chip counters Tom added (#745, #746, and the chip model work in MeshBench/virtual-sx1262#2) reached the control socket and experiment.export, but no window showed them. This puts them where somebody comparing firmware would look.

What changes

Node window, Radio tab

• IRQ suppressed, directly under the IRQ and DIO1 masks: events the chip raised that the firmware's mask kept out. Amber above zero. A chip that predates the count reads not counted, never 0, with the release the count arrived in (virtual-sx1262 v1.3.2).
• Spurious detections, under busy time. It was on the Stats tab and the node list but missing beside the other chip counters.

Bench view, sweep results

• IRQ suppressed and busy time, straight after delivered so they stay in view when the panel is docked narrow, and named as the Radio tab names them.
• IRQ suppressed: each arm's mean of the per-cell irq_suppressed, as a cost (fewer is green).
• busy time: each arm's mean detection-flag time, in seconds, absolute rather than a delta, because more busy time means a firmware seeing more of the traffic, which is neither better nor worse.
• Both are averaged only over the seeds whose chips counted them, and drawn as a dash where none did (an emulated node sends no record). A baseline without them leaves the other arms absolute instead of a delta against an unmeasured zero.
• The caption under the table says which columns are costs and what a dash means.

Verbs

• experiment.results arm summaries carry irq_suppressed and busy_ms, absent where nothing counted. Its description says so; docs/verbs.json and docs/verb-reference.md are regenerated.

Pictures

radioshot_test.go (new) and a chip-counters case in sweepshot_test.go draw these from real numbers out of a 15-cell scotland-strict run (MeshCore 1.16.0, 1.17.0, 1.17.1 at virtual-sx1262 v1.3.3):

MESHBENCH_SHOTS=<dir> go test ./internal/ui/workbench/nodeview -run TestDrawTheRadioTab
MESHBENCH_SHOTS=<dir> go test ./internal/ui/workbench -run TestDrawTheSweepResults

Verification

• go test for internal/app/session/experiment, internal/app/state, internal/ui/workbench (control audit included), internal/ui/workbench/nodeview and internal: pass.
• New tests, each failing without its change: an arm's chip means leave out uncounted seeds and are absent with none; a chip that did not count draws a dash and leaves its neighbour absolute; fewer suppressed is painted better; the radio row says "not counted" rather than 0 and marks a non-zero count.
• gofmt, go vet: clean. tools/lint-ratchet.sh with golangci-lint v2.12.2: holds.
• verbdoc.py --check: current. Verb manifest test: passes.

Manual: a MeshBench/docs PR follows with the same pictures.