Verify Linux speech client portability and reconcile release roadmap

docs/LINUX-SPEECH-0.1.6.md

@@ -0,0 +1,28 @@
+# Linux speech client portability check
+
+2026-10-13, Ubuntu 24.04 WSL x86-64. Immutable source snapshot from commit
+`9bc7221`; existing isolated Cargo cache and target, locked offline dependencies.
+`SEARCHI_FORCE_CPU=1` throughout. No model inference or GPU execution occurred.
+
+Executed checks:
+
+```sh
+cargo test -p searchi-speech --locked --offline
+cargo check -p searchi-cli --locked --offline
+SEARCHI_TEST_PYTHON=python3 cargo test -p searchi-speech actual_subprocess_timeout_and_overflow_are_reaped --locked --offline -- --ignored --nocapture
+```
+
+Five default unit tests passed. The real owned-subprocess transport test also
+passed: timeout and oversized framing reaped their child processes; only the
+typed transport failure was eligible for recovery. The genuine native speech
+model test remained ignored. CLI compilation passed, including the shared
+speech/service/assets dependencies, without desktop dependencies.
+
+Recorded command output: speech compilation 11.67 seconds; headless dependency
+check 7.28 seconds; real transport test 0.14 seconds. These are build/test durations,
+not inference or search performance measurements.
+
+Snapshot: `/home/karl/.cache/searchi-validation/linux-source-9bc7221`.
+This closes a client portability check only. It does not prove the Linux native
+speech worker, model setup, runtime packaging, recognition quality, desktop UI
+or GPU operation. Published Linux downloads remain version 0.1.4.