Video: show real duration, stay on replay prompt at end

Fix the playback HUD showing "/ 0:00": duration is re-polled in the
render loop until sceAvPlayerGetStreamInfo reports it, instead of being
latched once before async parsing finishes.

When a video reaches its end, hold on the last frame with an
"X replay / O back" prompt instead of returning to the detail screen
(which, for server videos, forced a full re-download to watch again).
X replays from the still-local file via re-init; the decoder claim is
held across replays.

Also add the agentic loop tooling/docs: AgenticLoop.md runbook
(build, install, drive Vita3K via kwin-mcp, zero-context-cost frame
capture), controls.MD key map, deploy.sh, .mcp.json, and gitignore
build-native/ and agent-run/.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

controls.MD

@@ -0,0 +1,29 @@
+D-pad
+  up: ArrowUp
+  left : ArrowLeft
+  right : ArrowRight
+  down : ArrowDown
+Left Stick
+  Up : W
+  Left : A
+  Right : D
+  Down : S
+L1 : Q
+L2 : E
+Face Buttons:
+  Triangle : V
+  Square : Z
+  Circle : C
+  Cross : X
+Right Stick:
+  Up : I
+  Left : J
+  Right : L
+  Down: K
+PS Button : P
+Select : Shift Right
+Start : Enter
+L2 : U
+L3 : F
+R3 : H
+R2 : O