v0.8: TCP transport via gatuna tunnel, session IDs, pre-synth playback, server Rust rewrite

BACKLOG.md

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+# Robovoice Backlog
+
+## Second-order PTT
+
+When a game is running, it has its own PTT button (e.g. a voip push-to-talk
+key). Robovoice should simulate pressing the game's PTT key before TTS audio
+output begins, and release it after playback finishes.
+
+This lets the TTS audio be transmitted through the game's voip channel to
+other players.
+
+### Considerations
+
+- Needs a configurable "game PTT key" (separate from Robovoice's own PTT key)
+- Use `SendInput` or `keybd_event` to synthesize the keypress
+- Press the game PTT key right before buffered audio starts playing
+- Release it after `AudioOutput` finishes playback (need a playback-complete
+  signal — currently `Flush()` doesn't provide one)
+- Edge cases: what if the user presses Robovoice PTT while game PTT is still
+  held from a previous utterance? Flush should release game PTT too.
+- Should this be a per-output-device setting? (CABLE Output vs speakers)