media: migrate early zero video offset

AGENTS.md

@@ -221,4 +221,4 @@ Context: 0.16.x proved that queue tweaks and static calibration cannot guarantee
 - 2026-05-01: Added `GetUpstreamSync` RPC, `lesavka-relayctl upstream-sync`, launcher diagnostics text, and mirrored-probe before/after planner snapshots so 0.17 probe runs report the exact planner state under test.
 - 2026-05-01: Validation green: `cargo test -p lesavka_server --lib --bins`, `cargo test -p lesavka_testing`, `cargo test -p lesavka_client --bins --lib`, and targeted installer/RPC/layout contracts.
 - 2026-05-01: First installed 0.17.0 mirrored browser probe on client/server commit `3920e0a` failed honestly: planner reported fresh live state (`live_lag_ms=10`, `skew_ms=+20.7`) but browser-observed paired pulses showed audio late by median `+349.1ms`, p95 `429.1ms`, with 6 video freezes/skew drops. Replayed artifact after analyzer hardening now reports `gross_failure` instead of false raw-start `catastrophic_failure`.
-- 2026-05-01: Patch follow-up models the observed MJPEG/UVC browser egress delta by defaulting video playout offset to `+350ms` and preserving the 1s freshness ceiling. Raw activity-start evidence is now ignored for verdict/calibration when it disagrees with paired pulses that are already failing directly.
+- 2026-05-01: Patch follow-up models the observed MJPEG/UVC browser egress delta by defaulting video playout offset to `+350ms` and preserving the 1s freshness ceiling. Raw activity-start evidence is now ignored for verdict/calibration when it disagrees with paired pulses that are already failing directly. Existing early-0.17 `audio=0/video=0` factory/env calibration files migrate to the new `video=+350ms` default on load.

server/src/calibration.rs

@@ -245,7 +245,8 @@ fn migrate_legacy_snapshot(mut state: CalibrationSnapshot) -> CalibrationSnapsho
             .contains("loaded upstream A/V calibration defaults");
     let untouched_legacy_audio = (matches!(
         state.default_audio_offset_us,
-        LEGACY_FACTORY_MJPEG_AUDIO_OFFSET_US
+        FACTORY_MJPEG_AUDIO_OFFSET_US
+            | LEGACY_FACTORY_MJPEG_AUDIO_OFFSET_US
             | PREVIOUS_FACTORY_MJPEG_AUDIO_OFFSET_US
             | PREVIOUS_TUNED_MJPEG_AUDIO_OFFSET_US
     ) || clamped_previous_baseline)
@@ -486,6 +487,37 @@ mod tests {
         });
     }
 
+    #[test]
+    fn load_migrates_early_zero_video_factory_mjpeg_baseline() {
+        let file = NamedTempFile::new().expect("temp calibration file");
+        std::fs::write(
+            file.path(),
+            r#"
+            profile="mjpeg"
+            default_audio_offset_us=0
+            default_video_offset_us=0
+            active_audio_offset_us=0
+            active_video_offset_us=0
+            source="factory"
+            confidence="factory"
+            detail="loaded upstream A/V calibration defaults"
+            "#,
+        )
+        .expect("early zero calibration seed");
+        let path = file.path().to_string_lossy().to_string();
+        temp_env::with_var("LESAVKA_CALIBRATION_PATH", Some(path.as_str()), || {
+            let runtime = Arc::new(UpstreamMediaRuntime::new());
+            let store = CalibrationStore::load(runtime.clone());
+            let state = store.current();
+            assert_eq!(state.active_audio_offset_us, 0);
+            assert_eq!(state.default_audio_offset_us, 0);
+            assert_eq!(state.active_video_offset_us, 350_000);
+            assert_eq!(state.default_video_offset_us, 350_000);
+            assert_eq!(state.source, "factory");
+            assert_eq!(runtime.playout_offsets(), (350_000, 0));
+        });
+    }
+
     #[test]
     fn load_keeps_manual_legacy_sized_calibration() {
         let file = NamedTempFile::new().expect("temp calibration file");