dropped_chunks was incremented on cpal-callback channel-full and
validation requeue overflow but never read by the live session, so
the UI's dropped_audio_ms missed callback-level losses entirely.
Architecture doc had flagged this as a TODO. Also: the 350ms
validation buffer was requeued via try_send into the same 32-slot
channel, silently dropping past the cap on small-buffer audio hosts
(WASAPI exclusive, low-latency ALSA at 256 frames -> ~65 chunks).
Fix: live runtime reads MicrophoneCapture::dropped_chunks() on each
recv_audio tick (LiveSessionRuntime::poll_capture_drops) and converts
the per-chunk-duration delta into the dropped_audio_ms surfaced to
the UI overload status. Per-chunk duration is derived from the most
recent AudioChunk's sample_rate + samples-per-channel so it adapts
to whatever rate cpal is delivering at. Validation requeue moved
from try_send into the bounded channel onto a VecDeque<AudioChunk>
returned alongside the Receiver; ActiveCapture drains the replay
buffer before reading rx in recv_audio, bypassing the 32-slot cap
entirely. Architecture doc updated to remove the TODO and document
the new pre-roll path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Five-slice navigable map of the entire codebase under
docs/architecture-map/. Each slice is a self-contained
breadcrumbed sub-tree:
01-frontend (16) Svelte/SvelteKit UI
02-tauri-runtime (26) src-tauri commands + lifecycle
03-audio-transcription (16) audio + transcription crates
04-llm-formatting-mcp (19) llm, ai-formatting, mcp, cloud
05-core-storage-hotkey-build core, storage, hotkey, workspace,
(26) CI, dev glue
Plus master README.md and data-flow-end-to-end.md tracing
audio bytes from microphone to FTS5 search to MCP read.
Generated by 5 parallel subagents on 2026/05/09 against
HEAD 3c47000. Each page has YAML frontmatter, file:line code
refs, sibling cross-links, plain-English summaries.
Aggregated debt surfaced (full lists in master README):
RB-08 macOS power assertion, schema head drift v14 vs v15,
VAD blocked on ort version conflict, streaming primitives
not wired into live.rs, no prompt versioning, MCP has no
auth, cloud-providers in-memory keystore, SettingsPage
2 484 LOC, commands/live.rs 1 737 LOC, dual theme system,
brand rename to Lumenote pending across the codebase.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>