fix: fix devtunnel WebSocket disconnects and reconnect reliability

[IcyHot09]

What Changed

• Remove the 7-retry reconnect cap — client now retries indefinitely with exponential backoff capping at 64s between attempts, instead of entering a permanent "exhausted" state
• Add visibility guard on ping timeout to suppress false positives when the tab is backgrounded
• Add Stream.throttle to terminal, git progress, and shell snapshot streams to reduce burst rate
• Add congestion-aware 8s delay and visibility-wake on reconnect
• Fix visibility-wake to use a Set so all concurrent subscriptions are woken, not just the last one
• Enable perMessageDeflate WebSocket compression via @effect/platform-bun patch (60-80% payload reduction)

Why

When accessing T3 remotely via Microsoft devtunnel, the WebSocket connection
disconnects and reconnects every 2-3 seconds during normal use. Opening sessions
with large chat histories makes it worse — the initial snapshot load can sustain
the disconnect for 20+ seconds.

Root cause: devtunnel relays traffic over an SSH channel with a hardcoded 1 MB
window. Any burst of outbound data (terminal output, session snapshots, git
progress events) fills the window faster than the client can drain it. This
stalls all WebSocket frames including heartbeat ping/pong, triggering a timeout
disconnect. After 7 retries (~127s) the client entered a permanent "exhausted"
state and stopped trying — requiring a manual page refresh.

The throttling and compression reduce sustained burst rates below the saturation
threshold. The unlimited-retry fix ensures recovery when a burst does cause a
disconnect.

Checklist

• This PR is small and focused
• I explained what changed and why

---

Note

Medium Risk
Changes core WebSocket reconnect/backoff and subscription retry behavior, which can affect connectivity and resource usage under failure conditions. Server-side throttling and compression also alter runtime performance characteristics and could surface regressions in stream delivery timing.

Overview
Improves WebSocket stability under high-throughput conditions by throttling several high-volume server streams (orchestration shell snapshot/events, git action progress, terminal events) to smooth bursts.

On the client, removes the capped retry/exhausted reconnect state and switches protocol retry policy to retry forever, with updated state/tests and UI toasts (no max-attempt display, no exhausted toast).

Adds guards to reduce false disconnects and speed recovery: suppresses heartbeat timeout handling when the tab is hidden, and updates WsTransport subscription retries with a congestion-aware minimum delay plus a visibilitychange wake-up. Enables WebSocket perMessageDeflate via an @effect/platform-bun patch (and bumps package versions/lockfile accordingly).

^{Reviewed by Cursor Bugbot for commit b318893. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix WebSocket disconnect/no-reconnect loop when loading large sessions

• Removes the maximum reconnect attempt cap, making WsTransport retry indefinitely using exponential backoff instead of entering an exhausted/dead state
• Throttles high-volume server-side streams (orchestration at 50/100ms, thread events at 10/100ms, terminal events at 20/50ms) to prevent flooding the WebSocket during large session loads
• Adds a visibilitychange listener so reconnect sleeps wake immediately when the tab becomes visible again
• Ignores heartbeat ping timeouts while the document is hidden, preventing spurious disconnects in background tabs
• Enables perMessageDeflate on the Bun WebSocket server via a patch to reduce wire payload size
• Removes the 'exhausted' reconnect phase from UI state; the connection now stays in 'waiting' and retries indefinitely with a simplified toast UI

^{Macroscope summarized b318893.}

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR fundamentally changes WebSocket reconnection behavior from finite retries to infinite, adds stream throttling, visibility-based reconnect logic, and enables WebSocket compression via a vendor patch. These are significant runtime behavior changes that warrant careful human review despite the fix-framed title.

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