Add first-20s (p00/start) correction clips for startup-region latency check

.gitattributes

@@ -53,3 +53,7 @@ check/pushT__2026-06-18_episode_001__p85.mp4 filter=lfs diff=lfs merge=lfs -text
 check/pushT__2026-06-18_episode_002__p10.mp4 filter=lfs diff=lfs merge=lfs -text
 check/pushT__2026-06-18_episode_002__p50.mp4 filter=lfs diff=lfs merge=lfs -text
 check/pushT__2026-06-18_episode_002__p85.mp4 filter=lfs diff=lfs merge=lfs -text
+check/motherboard__2026-05-11_episode_005__p00.mp4 filter=lfs diff=lfs merge=lfs -text
+check/motherboard__2026-05-11_episode_012__p00.mp4 filter=lfs diff=lfs merge=lfs -text
+check/pushT__2026-06-18_episode_001__p00.mp4 filter=lfs diff=lfs merge=lfs -text
+check/pushT__2026-06-18_episode_002__p00.mp4 filter=lfs diff=lfs merge=lfs -text

check/motherboard__2026-05-11_episode_005__p00.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6340e370281b6dc30be4a69c58235c68a02543323026b17faac4abba02880b00
+size 7620410

check/motherboard__2026-05-11_episode_012__p00.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3f132fcf2f6a9861c28ac52eda8b7c7db90e4d21b2483c98dd20fca3b4a63ec1
+size 6494385

check/pushT__2026-06-18_episode_001__p00.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:bbfd8cbc60c10eabb9cece73b738ec5628278c0473d230461e0c8d0601ee2a1b
+size 6491669

check/pushT__2026-06-18_episode_002__p00.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d68bc817f5d2d9dc3fb5d40ebc0b1f1c5a5ec20a6071ccd9d319ada1b8407f92
+size 7454147

correction.html

@@ -76,11 +76,11 @@
   Raw onset clips: <a href="index.html">index.html</a> · positions p10/p50/p85 = ~early/mid/late.</footer>
 </div>
 <script>
-const META = [{"file": "motherboard__2026-05-11_episode_005__p10.mp4", "task": "motherboard", "name": "2026-05-11_episode_005__p10", "frames": 600, "pix": "yuv420p"}, {"file": "motherboard__2026-05-11_episode_005__p50.mp4", "task": "motherboard", "name": "2026-05-11_episode_005__p50", "frames": 600, "pix": "yuv420p"}, {"file": "motherboard__2026-05-11_episode_005__p85.mp4", "task": "motherboard", "name": "2026-05-11_episode_005__p85", "frames": 600, "pix": "yuv420p"}, {"file": "motherboard__2026-05-11_episode_012__p10.mp4", "task": "motherboard", "name": "2026-05-11_episode_012__p10", "frames": 600, "pix": "yuv420p"}, {"file": "motherboard__2026-05-11_episode_012__p50.mp4", "task": "motherboard", "name": "2026-05-11_episode_012__p50", "frames": 600, "pix": "yuv420p"}, {"file": "motherboard__2026-05-11_episode_012__p85.mp4", "task": "motherboard", "name": "2026-05-11_episode_012__p85", "frames": 600, "pix": "yuv420p"}, {"file": "pushT__2026-06-18_episode_001__p10.mp4", "task": "pushT", "name": "2026-06-18_episode_001__p10", "frames": 600, "pix": "yuv420p"}, {"file": "pushT__2026-06-18_episode_001__p50.mp4", "task": "pushT", "name": "2026-06-18_episode_001__p50", "frames": 600, "pix": "yuv420p"}, {"file": "pushT__2026-06-18_episode_001__p85.mp4", "task": "pushT", "name": "2026-06-18_episode_001__p85", "frames": 600, "pix": "yuv420p"}, {"file": "pushT__2026-06-18_episode_002__p10.mp4", "task": "pushT", "name": "2026-06-18_episode_002__p10", "frames": 600, "pix": "yuv420p"}, {"file": "pushT__2026-06-18_episode_002__p50.mp4", "task": "pushT", "name": "2026-06-18_episode_002__p50", "frames": 600, "pix": "yuv420p"}, {"file": "pushT__2026-06-18_episode_002__p85.mp4", "task": "pushT", "name": "2026-06-18_episode_002__p85", "frames": 600, "pix": "yuv420p"}];
+const META = [{"file": "motherboard__2026-05-11_episode_005__p00.mp4", "task": "motherboard", "name": "2026-05-11_episode_005__p00", "frames": 600}, {"file": "motherboard__2026-05-11_episode_005__p10.mp4", "task": "motherboard", "name": "2026-05-11_episode_005__p10", "frames": 600}, {"file": "motherboard__2026-05-11_episode_005__p50.mp4", "task": "motherboard", "name": "2026-05-11_episode_005__p50", "frames": 600}, {"file": "motherboard__2026-05-11_episode_005__p85.mp4", "task": "motherboard", "name": "2026-05-11_episode_005__p85", "frames": 600}, {"file": "motherboard__2026-05-11_episode_012__p00.mp4", "task": "motherboard", "name": "2026-05-11_episode_012__p00", "frames": 600}, {"file": "motherboard__2026-05-11_episode_012__p10.mp4", "task": "motherboard", "name": "2026-05-11_episode_012__p10", "frames": 600}, {"file": "motherboard__2026-05-11_episode_012__p50.mp4", "task": "motherboard", "name": "2026-05-11_episode_012__p50", "frames": 600}, {"file": "motherboard__2026-05-11_episode_012__p85.mp4", "task": "motherboard", "name": "2026-05-11_episode_012__p85", "frames": 600}, {"file": "pushT__2026-06-18_episode_001__p00.mp4", "task": "pushT", "name": "2026-06-18_episode_001__p00", "frames": 600}, {"file": "pushT__2026-06-18_episode_001__p10.mp4", "task": "pushT", "name": "2026-06-18_episode_001__p10", "frames": 600}, {"file": "pushT__2026-06-18_episode_001__p50.mp4", "task": "pushT", "name": "2026-06-18_episode_001__p50", "frames": 600}, {"file": "pushT__2026-06-18_episode_001__p85.mp4", "task": "pushT", "name": "2026-06-18_episode_001__p85", "frames": 600}, {"file": "pushT__2026-06-18_episode_002__p00.mp4", "task": "pushT", "name": "2026-06-18_episode_002__p00", "frames": 600}, {"file": "pushT__2026-06-18_episode_002__p10.mp4", "task": "pushT", "name": "2026-06-18_episode_002__p10", "frames": 600}, {"file": "pushT__2026-06-18_episode_002__p50.mp4", "task": "pushT", "name": "2026-06-18_episode_002__p50", "frames": 600}, {"file": "pushT__2026-06-18_episode_002__p85.mp4", "task": "pushT", "name": "2026-06-18_episode_002__p85", "frames": 600}];
 const FPS = 30;
 const SECTIONS=[{key:"motherboard",tag:"motherboard",cal:"calib · May-12"},{key:"pushT",tag:"pushT",cal:"calib · June-26"}];
 const root=document.getElementById("sections"); let active=null;
-const posName=n=>n.includes("p10")?"early":n.includes("p50")?"mid":n.includes("p85")?"late":"";
+const posName=n=>n.includes("p00")?"start":n.includes("p10")?"early":n.includes("p50")?"mid":n.includes("p85")?"late":"";
 function card(m){
   const c=document.createElement("div");c.className="ch";
   const ep=m.name.replace(/^\d{4}-\d{2}-\d{2}_/,"").split("__")[0];