docs(openrouter-video): sync with openrouter-web changes

[devin-ai-integration]

Summary

openrouter-web #29276 (add xAI Grok Imagine Video 1.5) made prompt optional on POST /api/v1/videos. The request schema changed prompt: z.string() → prompt: z.string().optional() and prompt was removed from the required list in the public openapi.yaml. Models that generate from image input alone (e.g. x-ai/grok-imagine-video-1.5 driven by frame_images) can now be called without a prompt; models that need one return a 400.

The openrouter-video SKILL.md still stated Required: model, prompt, which is now stale. Updated the Parameters section:

- Required: `model`, `prompt`.
+ Required: `model`. `prompt` is required by most models, but optional for
+ models that can generate from image input alone (e.g. x-ai/grok-imagine-video-1.5
+ driven by frame_images) — omitting it for a model that requires one returns a 400.

No other skills needed updates this cycle (the other merged changes were internal router/buddy-api/mission-control work with no public API surface change).

Link to Devin session: https://openrouter.devinenterprise.com/sessions/a1ba4ec556b14bfda94ab4be9c58c827

[devin-ai-integration]

Original prompt from Automation

You are the public skills sync pipeline. Your job is to scan PRs merged to main on OpenRouterTeam/openrouter-web in the last 24 hours, determine if any changes warrant updating the public agent skills in OpenRouterTeam/skills, and open PRs to the skills repo when updates are needed.

#``# Step 1: Identify relevant merged PRs

Clone both repos:

cd /home/ubuntu/repos/openrouter-web
git fetch origin main
git log --since='24 hours ago' --merges --first-parent origin/main --pretty=format:'%H|%s' --name-only

For each merged PR, collect the list of changed files. Only PRs that touch the paths in the mapping below are relevant. Skip bot commits (devin-ai-integration[bot], Devin AI, GitHub Actions Bot, openrouter[bot], opencode-agent[bot], OpenRouter SDK Bot, Claude, detail-app[bot], forge-the-devex-intern[bot], dependabot[bot]).

If no relevant PRs were merged, post a short message to the #devrel Slack channel (C08LQFVSC7Q) saying no skill-relevant changes were detected today, and exit.

#``# Step 2: Map changed files to affected skills

Use this mapping to determine which public skills are potentially affected:

openrouter-web paths	Affected skill(s) in OpenRouterTeam/skills
sdks/typescript/, packages/llm-interfaces/	openrouter-typescript-sdk, openrouter-agent-migration
services/cfw-*/src/routes/*analytics*, analytics query/response schemas	openrouter-analytics, openrouter-analytics-query, openrouter-analytics-schema
Generation routes, /api/v1/generation	openrouter-generations
Image generation adapters, packages/image-generation/	openrouter-images
supabase/seeds/, model schemas, /api/v1/models route	openrouter-models
OAuth/auth routes, PKCE flow code	openrouter-oauth
STT adapters, services/cfw-stt-api/, /api/v1/audio/transcriptions	openrouter-stt
TTS routes, /api/v1/audio/speech	openrouter-tts
Video adapters, /api/v1/videos	openrouter-video
``@`openr... (3383 chars truncated...)

[devin-ai-integration]

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