diff --git a/crates/colibri-contracts/tests/golden.rs b/crates/colibri-contracts/tests/golden.rs
index 7ed7a6a..a9de53a 100644
--- a/crates/colibri-contracts/tests/golden.rs
+++ b/crates/colibri-contracts/tests/golden.rs
@@ -11,6 +11,10 @@ const DOMEDOG_RUN: &str =
     include_str!("../../../manifests/2026-05-26-domedog-linux-lane-run-manifest.json");
 const DOMEDOG_CACHE: &str =
     include_str!("../../../manifests/2026-05-26-domedog-deepseek-cache-result.json");
+const OSA_CACHE: &str =
+    include_str!("../../../manifests/2026-05-26-osa-deepseek-cache-result.json");
+const OSA_GATE4_RUN: &str =
+    include_str!("../../../manifests/2026-05-26-osa-freebsd-gate4-run-manifest.json");
 
 fn roundtrip_eq<T>(value: &T)
 where
@@ -56,7 +60,10 @@ fn parses_domedog_run_manifest() {
     let run: RunManifest = serde_json::from_str(DOMEDOG_RUN).expect("parse domedog run manifest");
     assert_eq!(run.schema, RUN_MANIFEST_SCHEMA);
     assert_eq!(run.role, "linux-build-smoke");
-    assert_eq!(run.artifacts.get("runtime_inventory").map(String::as_str), Some("manifests/2026-05-26-domedog-runtime-inventory.json"));
+    assert_eq!(
+        run.artifacts.get("runtime_inventory").map(String::as_str),
+        Some("manifests/2026-05-26-domedog-runtime-inventory.json")
+    );
     roundtrip_eq(&run);
 }
 
@@ -71,6 +78,33 @@ fn parses_domedog_live_cache_result() {
     roundtrip_eq(&res);
 }
 
+#[test]
+fn parses_osa_live_cache_result() {
+    let res: ProviderSmokeResult = serde_json::from_str(OSA_CACHE).expect("parse osa cache result");
+    assert_eq!(res.schema, PROVIDER_SMOKE_SCHEMA);
+    assert_eq!(res.host, "osa");
+    assert_eq!(res.agent, "codex-osa");
+    assert_eq!(res.status, "ok");
+    assert!(res.cache_hit_observed, "expected a cache hit");
+    assert!(res.cache_hit_tokens > 0);
+    roundtrip_eq(&res);
+}
+
+#[test]
+fn parses_osa_gate4_run_manifest() {
+    let run: RunManifest = serde_json::from_str(OSA_GATE4_RUN).expect("parse osa gate4 run");
+    assert_eq!(run.schema, RUN_MANIFEST_SCHEMA);
+    assert_eq!(run.role, "freebsd-build-cache-smoke");
+    assert_eq!(run.agent.as_deref(), Some("codex-osa"));
+    assert_eq!(
+        run.artifacts
+            .get("deepseek_cache_result")
+            .map(String::as_str),
+        Some("manifests/2026-05-26-osa-deepseek-cache-result.json")
+    );
+    roundtrip_eq(&run);
+}
+
 #[test]
 fn provider_smoke_skipped_shape() {
     // No live result committed yet; assert the struct accepts a skipped result.
diff --git a/docs/MIGRATION-INVENTORY.md b/docs/MIGRATION-INVENTORY.md
index c33ed0f..c298742 100644
--- a/docs/MIGRATION-INVENTORY.md
+++ b/docs/MIGRATION-INVENTORY.md
@@ -90,35 +90,34 @@ the production service**.
 
 ## 5. Proof gates before replacing the Clawdie TS service
 
-1. ✅ `colibri-contracts` round-trips TS-produced fixtures (6 golden tests pass,
-   incl. the live cache result).
+1. ✅ `colibri-contracts` round-trips TS-produced fixtures (8 golden tests pass,
+   incl. Linux and FreeBSD live cache results).
 2. ✅ **DONE 26.maj.2026** — DeepSeek live cache manifest exists:
    `manifests/2026-05-26-domedog-deepseek-cache-result.json` — 3584/3661 prompt
    tokens cache-hit on domedog/Linux (~98%), model `deepseek-v4-flash`.
 3. Runtime inventory parity across osa / domedog / debby — osa ✅ + domedog ✅;
    debby pending.
-4. The first slice runs end-to-end on Linux **and** FreeBSD — Linux ✅ (incl.
-   live cache); **FreeBSD pending → see handoff below**.
+4. ✅ **DONE 26.maj.2026** — the first slice runs end-to-end on Linux **and**
+   FreeBSD. Linux evidence: domedog live cache result. FreeBSD evidence: osa
+   build/test and live cache result (`manifests/2026-05-26-osa-deepseek-cache-result.json`),
+   with 3584/3661 prompt tokens cache-hit on `deepseek-v4-flash`.
 5. Watchdog status read without breaking `doctor` / `pi-profile` — not started.
 6. No production TS path retired until 1–5 are green and the caller inventory
    in §2 is done.
 
-## Handoff: FreeBSD build lane (Codex · osa)
+## Completed: FreeBSD build lane (Codex · osa)
 
-Closes the FreeBSD half of gate #4. On osa:
+Codex completed the FreeBSD half of gate #4 on osa on 26.maj.2026:
 
-1. `git pull` Colibri to `main`.
-2. `cargo build --workspace --release` — confirm `colibri-contracts`,
-   `colibri-deepseek`, and the root binaries compile on FreeBSD (rustls/tokio).
-3. `cargo test --workspace` — golden tests should pass (they include the domedog
-   live-cache fixture).
-4. Optional but valuable: with the DeepSeek key on osa, run
-   `COLIBRI_HOST=osa COLIBRI_AGENT=codex-osa ./target/release/colibri-probe` and
-   commit the result as `manifests/2026-05-26-osa-deepseek-cache-result.json` — a
-   FreeBSD live-cache manifest alongside domedog's.
+1. Pulled Colibri `main` to `0dc3e94`.
+2. `cargo build --workspace --release` passed on FreeBSD.
+3. `cargo test --workspace` passed after adding the osa cache and run manifests
+   to golden contract coverage.
+4. Ran `COLIBRI_HOST=osa COLIBRI_AGENT=codex-osa ./target/release/colibri-probe`
+   with local-only DeepSeek key material and committed the key-free usage result
+   as `manifests/2026-05-26-osa-deepseek-cache-result.json`.
 
-Done when: workspace builds + tests pass on FreeBSD; (optional) osa cache
-manifest committed. Report via a run manifest.
+Run manifest: `manifests/2026-05-26-osa-freebsd-gate4-run-manifest.json`.
 
 ## Architecture boundary (GUI / Zed / Herdr)
 
diff --git a/manifests/2026-05-26-osa-deepseek-cache-result.json b/manifests/2026-05-26-osa-deepseek-cache-result.json
new file mode 100644
index 0000000..4409615
--- /dev/null
+++ b/manifests/2026-05-26-osa-deepseek-cache-result.json
@@ -0,0 +1,30 @@
+{
+  "schema": "clawdie.provider-smoke.result.v1",
+  "test_id": "colibri-probe-20260526T125645Z",
+  "host": "osa",
+  "agent": "codex-osa",
+  "provider": "deepseek",
+  "model": "deepseek-v4-flash",
+  "started_at": "2026-05-26T12:56:45.956258868+00:00",
+  "ended_at": "2026-05-26T12:56:50.404507738+00:00",
+  "status": "ok",
+  "warm_usage": {
+    "prompt_tokens": 3661,
+    "completion_tokens": 2,
+    "total_tokens": 3663,
+    "prompt_cache_hit_tokens": 3584,
+    "prompt_cache_miss_tokens": 77
+  },
+  "probe_usage": {
+    "prompt_tokens": 3661,
+    "completion_tokens": 1,
+    "total_tokens": 3662,
+    "prompt_cache_hit_tokens": 3584,
+    "prompt_cache_miss_tokens": 77
+  },
+  "cache_hit_tokens": 3584,
+  "cache_hit_observed": true,
+  "notes": [
+    "prefix cache HIT on second request"
+  ]
+}
diff --git a/manifests/2026-05-26-osa-freebsd-gate4-run-manifest.json b/manifests/2026-05-26-osa-freebsd-gate4-run-manifest.json
new file mode 100644
index 0000000..9d20caf
--- /dev/null
+++ b/manifests/2026-05-26-osa-freebsd-gate4-run-manifest.json
@@ -0,0 +1,30 @@
+{
+  "schema": "clawdie.interagent.run-manifest.v1",
+  "test_id": "colibri-freebsd-gate4-20260526T130639Z",
+  "role": "freebsd-build-cache-smoke",
+  "host": "osa",
+  "agent": "codex-osa",
+  "started_at": "2026-05-26T12:56:23Z",
+  "ended_at": "2026-05-26T13:06:39Z",
+  "protocols": {},
+  "network": {},
+  "artifacts": {
+    "deepseek_cache_result": "manifests/2026-05-26-osa-deepseek-cache-result.json",
+    "domedog_cache_result": "manifests/2026-05-26-domedog-deepseek-cache-result.json"
+  },
+  "summary": {
+    "git_base": "0dc3e94",
+    "cargo_build_release": "pass",
+    "cargo_test": "pass — 8 passed (golden contracts)",
+    "deepseek_live_probe": "pass — 3584/3661 prompt tokens cache-hit on FreeBSD osa",
+    "cache_hit_observed": "true"
+  },
+  "raw_transfer_required": false,
+  "notes": [
+    "FreeBSD build lane green on osa after pulling Colibri main 0dc3e94.",
+    "cargo build --workspace --release completed successfully on FreeBSD.",
+    "cargo test --workspace completed successfully with 8 golden tests passing, including domedog and osa live-cache fixtures.",
+    "Optional osa DeepSeek live probe was run with local key material only; committed manifests contain usage counters only and no secret values.",
+    "Gate #4 FreeBSD half is satisfied: first slice builds, tests, and observes DeepSeek prefix-cache hits on FreeBSD."
+  ]
+}