Windows update-progress console probe on CI (#381) + hold pushes behind background sub-agents (#389)

[heypandax]

#381 — Windows update progress still scrolls line by line

The 2.1.2 package contains the in-place redraw. Progress is drawn by the updater that is currently running, though. 2.1.2 is the latest release, so any download progress a user sees now came from a ≤2.1.1 updater, and those versions always print lines on Windows. The redraw first shows up on the 2.1.2 → next update.

The redraw depends on a JNA GetConsoleMode(stderr) probe that has never run on real Windows. If that call fails, it quietly falls back to plain lines. This PR adds UpdateProgressWinConsoleTest to the existing windows-latest job (*WinConsole*), which checks that:

• the probe returns false, not null, in the Gradle worker (piped stderr);
• a child JVM with 2>CON decides to redraw in place;
• a child JVM with 2>NUL keeps plain lines.

#389 — one notification per background sub-agent

Each background sub-agent that returns wakes the main agent for another turn, and each turn result pushed "complete". Now, when a clean result arrives while background sub-agents or Workflow runs are still RUNNING, its push is held. The turn that ends with none left pushes instead.

• Errors and usage-limit results are never held. Background Bash and Monitor jobs never hold a push, because a dev server may never finish.
• Fallbacks for the held push:
  • it is released 60s after the last agent settles, if no continuation turn is running;
  • a 30-minute backstop releases it regardless;
  • if the process dies, the death push replaces it, or the held push goes out if the death falls inside the quiet window;
  • an intentional stop drops it.
• Android: newly created notification channels enable vibration. Existing channels are frozen by Android and are not migrated.

iOS already sends sound: default, so a banner-only alert there points at device settings (Sounds / Focus / Scheduled Summary). The push diagnostics' soundSetting can confirm this.

Verification

• :daemon:test: 2355 tests, all pass except AgentProcessShutdownTest, which failed once under full-suite load (exit 141 instead of 137). It passed 5/5 when rerun on its own.
• New ConversationPushTest cases: fan-out gives one push, failures are pushed immediately, a background shell does not hold, and both the settle and backstop fallbacks fire. With the hold disabled, 2 of them fail as expected.
• The Windows probe test and the Android compile (no local SDK) run in this PR's CI.

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