docs(port): record Linux gate results — 228 tests green on domedog (Sam & Claude)

Verified the 0.11.0 release tree on Linux (domedog.pro, Debian) before
tagging:
  cargo fmt --check             ✅
  cargo build --workspace --release  ✅ (4m 31s)
  cargo clippy -D warnings      ✅
  cargo test --workspace        ✅ (228 passed, 0 failed)

FreeBSD runtime validation remains the pre-poudriere step.

packaging/freebsd/port/README.md

@@ -59,6 +59,25 @@ port — the clawdie-iso repo consumes it from here and keeps no duplicate.
    poudriere-build.sh --jail clawdie-amd64 --ports clawdie sysutils/colibri
    ```
 
+## Validation
+
+### Linux cross-build gate (domedog, 2026-06-20)
+
+The source tree is cross-platform (FreeBSD + Linux). Before tagging, the full
+Rust gate was verified on Linux (`domedog.pro`, Debian):
+
+```sh
+cargo fmt --check                              # ✅ clean
+cargo build --workspace --release              # ✅ 4m 31s
+cargo clippy --workspace --all-targets -- -D warnings  # ✅ zero warnings
+cargo test --workspace                         # ✅ 228 passed, 0 failed
+```
+
+228 tests cover all 13 crates including unit, integration, golden, and
+live-socket tests. This confirms the `0.11.0` tree compiles and passes on
+Linux. FreeBSD runtime validation (`cargo test` on FreeBSD 15) is the
+remaining step before the first poudriere build.
+
 ## Notes
 
 - **License:** MIT (matches `Cargo.toml`; same as layered-soul).