* fix(dashboard): clamp PTY resize dimensions for WSL2 winsize garbage
WSL2 reports columns=131072, rows=1 from a broken winsize probe. The
dashboard /chat tab forwards xterm.js dimensions through PtyBridge.resize(),
which packs them as unsigned short via struct.pack. 131072 > 65535 raised
struct.error — uncaught (only OSError was handled) — breaking the resize
path and leaving the TUI laid out for a one-row, absurdly-wide screen, which
surfaces as blank/disappearing text.
Clamp cols/rows to a sane [1, 2000]x[1, 1000] range before packing.
Non-finite/non-integer probes fall back to the minimum so nothing can reach
struct.pack and raise.
* test(dashboard): de-flake pub/events broadcast test
test_pub_broadcasts_to_events_subscribers round-tripped a frame through
two nested Starlette TestClient WebSocket portals within a 10s wall-clock
budget. Under heavy parallel CI load a starved ASGI thread occasionally
blew that budget even though the server logic is correct, producing
intermittent 'broadcast not received within 10s' failures.
Drive _broadcast_event directly under asyncio with fake subscribers
instead. Same fan-out contract (verbatim delivery to every subscriber on
the channel, nothing to other channels), zero scheduling surface. Runs in
~0.3s, deterministic across 10 consecutive runs.
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