feat(cctv): draw stills at source aspect, pillarboxed

docs/CURRENT-STATE.md

@@ -4341,7 +4341,7 @@ silently demoting every later lookup for the session.
 - **FIRMS**: no ground clamping (zero 3D-tiles height sampling), ≤18 screen-decluttered ambient labels, click-to-inspect detail card, 2.5k/3k sprite budgets viewport-clipped by FRP.
 - **CCTV v2 foundation:** a pitched
   frustum wireframe (4 corner rays + far-cap rectangle) with a monitor plane at the frustum's
-  far cap, retargeting the existing video/canvas texture pipeline. Manual calibration only —
+  far cap, retargeting the existing video/canvas texture pipeline. Stills are drawn at their source aspect, centered on the placeholder dark (`#01070c`), instead of being stretched to the 16:9 canvas. Manual calibration only —
   auto-calibration and the drape mesh pipeline are deleted. A one-shot activation obstruction
   probe (`pickFromRay` on camera activation, clamping the plane short of the first hit) remains;
   ground placement is superseded by the shared-floor v3 behavior below. Calibration persists to

src/layers/cctv/frames.js

@@ -12,6 +12,28 @@ import {
   PLACEHOLDER_REPAINT_MS,
 } from './policy.js';
 
+function fitToProjection(sourceW, sourceH) {
+  if (!sourceW || !sourceH)
+    return {
+      x: 0,
+      y: 0,
+      w: PROJECTION_CANVAS_WIDTH,
+      h: PROJECTION_CANVAS_HEIGHT,
+    };
+  const scale = Math.min(
+    PROJECTION_CANVAS_WIDTH / sourceW,
+    PROJECTION_CANVAS_HEIGHT / sourceH,
+  );
+  const w = Math.round(sourceW * scale);
+  const h = Math.round(sourceH * scale);
+  return {
+    x: Math.round((PROJECTION_CANVAS_WIDTH - w) / 2),
+    y: Math.round((PROJECTION_CANVAS_HEIGHT - h) / 2),
+    w,
+    h,
+  };
+}
+
 export function createFrames({ state: layerState, services, parts, source }) {
   /**
    * FNV-1a over the RGB channels of a downsampled frame. Pure (takes the raw
@@ -328,19 +350,18 @@ export function createFrames({ state: layerState, services, parts, source }) {
           return;
         }
         runtime.lastFrameSignature = signature;
-        runtime.ctx.clearRect(
+        runtime.ctx.fillStyle = '#01070c';
+        runtime.ctx.fillRect(
           0,
           0,
           PROJECTION_CANVAS_WIDTH,
           PROJECTION_CANVAS_HEIGHT,
         );
-        runtime.ctx.drawImage(
-          runtime.image,
-          0,
-          0,
-          PROJECTION_CANVAS_WIDTH,
-          PROJECTION_CANVAS_HEIGHT,
+        const fit = fitToProjection(
+          runtime.image.naturalWidth,
+          runtime.image.naturalHeight,
         );
+        runtime.ctx.drawImage(runtime.image, fit.x, fit.y, fit.w, fit.h);
         runtime.canvasStamp = (runtime.canvasStamp || 0) + 1;
         runtime.lastPlaceholderPaintAt = 0;
       }