Add verification report for freedv-ka9q (re-target to main)

doc/verification/005-freedv-ka9q.md

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+# RADE Integration Verification Report
+
+## Application Under Test
+
+| Field | Value |
+|---|---|
+| Application name | freedv-ka9q |
+| Application version / git hash | [f07b29d](https://github.com/tmiw/freedv-integrations/pull/15/commits/f07b29daaba711c58cbf475cdda93061d4d55543) |
+| Platform (OS + version) | Ubuntu 26.01.1 LTS, kernel 7.0.0-30-generic, x86_64 
+| Tester name / callsign | Mooneer Salem / K6AQ |
+| Date | 2026-09-19 |
+| radae repo commit hash | [0ba4e95](https://github.com/drowe67/radae/commit/0ba4e9502627178cf092c535fb6fbec9c367d397) |
+| rade_c repo commit hash | [7eda42f](https://github.com/freedv/rade_c/commit/7eda42f0f10ec5df6ff409527f5855d5b3ed1c94) |
+
+## Signal Path Declaration
+
+- [x] No additional signal processing (AGC, noise gate, resampler, EQ,
+      compression) between WAV file input and RADE encoder input during
+      this verification test
+
+## Baseline Loss (Step 1)
+
+Re-run with the current repository version before filling in this section.
+
+| Field | Value |
+|---|---|
+| Baseline loss | 0.079 |
+| 10% tolerance window | baseline ± 0.0079 |
+
+Command used:
+```
+$ pwd
+/home/ubuntu/freedv-integrations/build/src/backend/rade_build
+$ ./src/rade_tx_wav -f txfeatures.f32 ../rade_src/wav/all.wav tx.wav --v2
+$ ./src/rade_rx_wav -f rxfeatures.f32 tx.wav rx.wav --v2
+$ git clone https://github.com/drowe67/radae.git
+$ python3 radae/loss.py txfeatures.f32 rxfeatures.f32 --clip_start 100 --clip_end 300
+```
+
+## Level 1 — Software Loopback (mandatory)
+
+- [x] Pass (loss within ±10% of baseline)
+
+| Field | Value |
+|---|---|
+| Loss result | 0.079 |
+
+Command used / reproduction notes:
+```
+# (note: assumes baseline loss commands executed above)
+
+$ pwd
+/home/ubuntu/freedv-integrations/build
+$ cp src/backend/rade_build/tx.wav .
+$ cp src/backend/rade_build/txfeatures.f32 .
+$ sox tx.wav -t raw -r 8000 -c 1 -b 16 -e signed-integer - | ./src/ka9q/freedv-ka9q --rx-features rxfeatures.f32 >/dev/null
+$ python3 src/backend/rade_build/radae/loss.py txfeatures.f32 rxfeatures.f32 --clip_start 100 --clip_end 300
+```
+
+## Level 2 — OTAC: Over The Audio Cable (mandatory for hardware integrations)
+
+- [x] Pass (loss within ±10% of baseline)
+- [ ] N/A (software-only integration)
+
+| Field | Value |
+|---|---|
+| Loss result | 0.081 |
+| Sound card (Tx) | N/A |
+| Sound card (Rx) | Generalplus USB Audio Device (USB VID 0x1B3F, PID 0x2008) + USB isolator |
+| Cable description | ~1m 3.5mm cable |
+
+Photo of test setup:
+![](005-freedv-ka9q.jpg)
+
+Reproduction notes:
+```
+# (Assumes Level 1 done above.)
+# Use wpctl status to get correct target IDs for pw-record/pw-play.
+# Also, use pavucontrol or similar to adjust input and output to 50% volume.
+
+# In first terminal window
+$ pwd
+/home/ubuntu/freedv-integrations/build
+$ pw-record --target 74 --rate 8000 --channels 1 - | ./src/ka9q/freedv-ka9q --rx-features rxfeatures.f32 >/dev/null &
+
+# In another terminal
+$ pwd
+/home/ubuntu/freedv-integrations/build
+$ pw-play --target 73 tx.wav
+
+# Needed to flush rest of audio through pipewire
+$ sox -n silence.wav trim 0 10
+$ pw-play --target 73 silence.wav 
+$ killall pw-record
+
+# Back in first terminal window
+$ python3 src/backend/rade_build/radae/loss.py txfeatures.f32 rxfeatures.f32 --clip_start 100 --clip_end 300
+```
+
+## Level 3 — OTC: Over The Coax (optional)
+
+- [ ] Pass (loss within ±10% of baseline)
+- [x] Not performed
+
+| Field | Value |
+|---|---|
+| Loss result | |
+| Tx radio | |
+| Rx radio | |
+| Attenuator(s) | |
+
+Photo of test setup:
+_(attach or link)_
+
+Reproduction notes:
+```
+(paste notes here)
+```
+
+## Summary
+
+| Level | Result |
+|---|---|
+| Level 1 — Software loopback | PASS |
+| Level 2 — OTAC | PASS |
+| Level 3 — OTC | N/A |
+
+Additional notes: