Adds a single call_t0 = Instant::now() at the top of the Android
CallEngine::start path, threaded through send + recv tasks as
send_t0 / recv_t0, and tags the following milestones with
t_ms_since_call_start so we can build a clean side-by-side log of
first-call vs rejoin:
1. QUIC connection established
2. handshake complete
3. wzp-native audio_start returned (+ how long audio_start itself took)
4. send task spawned
5. send: first full capture frame read (+ short_reads_before count)
6. send: first non-zero capture RMS
7. recv task spawned
8. recv: first media packet received
9. recv: first successful decode
10. recv: first playout-ring write
Combined with the existing C++-side cb#0 logs in
crates/wzp-native/cpp/oboe_bridge.cpp ("capture cb#0", "playout
cb#0") this gives us full-pipeline ordering with no native-side
changes needed.
PRD: .taskmaster/docs/prd_android_first_join_no_audio.txt
Task: 32 (first task in the chain — diagnostics before any fix
attempts so we know which of the 5 suspect causes is real).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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