[68e1e4db] Video: release 0.26.0 (#604)

* [68e1e4db] feat(video): author release-0.26.0 marketing clip in the panel-demo kit register

* [68e1e4db] fix(video): extend pk-frame clip window to full length to kill black-gap render bug

* [68e1e4db] docs(video): document release-0.26.0 composition structure in motion/README

Added a comprehensive "Release-specific example: release-0.26.0" section documenting the v0.26.0 marketing video composition: a 40-second panel-demo kit clip showcasing four key features (orchestrator security hardening, three-forge support, Telegram Mini App V4, active guard mode) with choreographed panel elements, stats overlay, and dual-format captions. Includes preview/test instructions, props.js shape, captions schema with verified character counts, and smoke-test invariants matching the pattern established by release-0.25.0.

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Co-authored-by: UX/UI Developer 1 <ux-dev-1@roboco.tech>
Co-authored-by: UX/UI Documenter <ux-doc@roboco.tech>

motion/compositions/release-0.26.0/captions.json

@@ -0,0 +1,18 @@
+{
+  "composition_id": "release-0.26.0",
+  "occasion": "release: RoboCo v0.26.0",
+  "platforms": {
+    "x": {
+      "caption": "v0.26.0 is out.\nOrchestrator API is off the public internet now.\nGitHub, Gitea, GitLab: one API.\nTelegram cockpit is a real client.\nI approved once. 25 agents shipped it.\nroboco.tech",
+      "char_count": 182,
+      "limit": 280,
+      "within_limit": true
+    },
+    "tiktok": {
+      "caption": "v0.26.0 is out.\n\nThe orchestrator API is off the public internet. No more raw access to the control plane.\n\nThree forges are first class now: GitHub, Gitea, GitLab. One API, one review flow, pick your forge.\n\nThe Telegram Mini App is a real client now: today brief, approvals, chat, all live off one socket.\n\nfastapi-guard is active enforcement. Not passive anymore.\n\nI approved once. 25 agents shipped it.\n\nroboco.tech",
+      "char_count": 419,
+      "limit": 2200,
+      "within_limit": true
+    }
+  }
+}