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Two ingest bugs caused real ESP32-C6 HE20 CSI to be silently discarded or never received — the "real data silently lost" failure class. Each fix is pinned by a test that fails on the old code. #1009 §1b — HE20 baseline recorder trimmed 256->242 bins by sequential index. ESP-IDF v5.5.2 delivers all 256 FFT bins for an HE20 frame, but CalibrationConfig::he20() carried num_active: 242, so the recorder (no HE20 tone map — extract_first_stream takes the first num_active columns sequentially) kept bins 0..242 = the lower guard band + DC, NOT the 242 active tones, silently corrupting the empty-room baseline. Now num_active: 256 records every delivered bin, aligned 1:1 with the live deviation() path. The exact-242 tone map stays only in cir.rs (HE20_ACTIVE), where the Phi sensing matrix needs it. HE20 synthetic/bench fixtures updated to feed 256-bin frames. #1009 §1a/§1c — u8->u16 n_subcarriers truncation, regression-pinned. The ADR-018 wire format carries n_subcarriers as u16 LE at bytes 6-7; a 256-bin HE20 frame (byte6=0x00) read as one byte decodes to 0 subcarriers -> every frame skipped. The CLI parser and the sensing-server parse_esp32_frame were already corrected to u16 under #1005/ADR-110; added regression tests that fail on the old single-byte read so the truncation cannot silently return. #1004 — --source auto latched on simulate forever, never binding UDP :5005. A one-shot boot probe resolved the source once; with no CSI flowing at boot (the normal firmware/server startup race) it served simulated poses for the whole process and ignored real CSI arriving seconds later (the prior #937 fix hard-exited instead — equally wrong). New plan_source() state machine: in auto mode ALWAYS bind the UDP receiver and serve simulated only until the first real frame, then udp_receiver_task promotes source -> esp32 (mirroring the existing esp32 -> esp32:offline reversion). simulated_data_task self-suspends once promoted. Explicit --source simulated stays a hard, UDP-free offline override. Validation: 3-crate tests 1118 passed / 0 failed; workspace 3166 passed / 0 failed; Python proof VERDICT: PASS (bit-exact, unaffected). cir.rs untouched. Co-Authored-By: claude-flow <ruv@ruv.net>