feat: consolidate all Anthropic plugins into ECC v2.0.0

Ports functionality from 10+ separate plugins into ECC so users only
need one plugin installed. Consolidates: pr-review-toolkit, feature-dev,
commit-commands, hookify, code-simplifier, security-guidance,
frontend-design, explanatory-output-style, and personal skills.

New agents (8): code-architect, code-explorer, code-simplifier,
comment-analyzer, conversation-analyzer, pr-test-analyzer,
silent-failure-hunter, type-design-analyzer

New commands (9): commit, commit-push-pr, clean-gone, review-pr,
feature-dev, hookify, hookify-list, hookify-configure, hookify-help

New skills (8): frontend-design, hookify-rules, github-ops,
knowledge-ops, lead-intelligence, oura-health, pmx-guidelines, remotion

Enhanced skills (8): article-writing, content-engine, market-research,
investor-materials, investor-outreach, x-api, security-scan,
autonomous-loops — merged with personal skill content

New hook: security-reminder.py (pattern-based OWASP vulnerability
warnings on file edits)

Totals: 36 agents, 69 commands, 128 skills, 29 hook scripts

skills/remotion/rules/get-video-duration.md

@@ -0,0 +1,58 @@
+---
+name: get-video-duration
+description: Getting the duration of a video file in seconds with Mediabunny
+metadata:
+  tags: duration, video, length, time, seconds
+---
+
+# Getting video duration with Mediabunny
+
+Mediabunny can extract the duration of a video file. It works in browser, Node.js, and Bun environments.
+
+## Getting video duration
+
+```tsx
+import { Input, ALL_FORMATS, UrlSource } from "mediabunny";
+
+export const getVideoDuration = async (src: string) => {
+  const input = new Input({
+    formats: ALL_FORMATS,
+    source: new UrlSource(src, {
+      getRetryDelay: () => null,
+    }),
+  });
+
+  const durationInSeconds = await input.computeDuration();
+  return durationInSeconds;
+};
+```
+
+## Usage
+
+```tsx
+const duration = await getVideoDuration("https://remotion.media/video.mp4");
+console.log(duration); // e.g. 10.5 (seconds)
+```
+
+## Using with local files
+
+For local files, use `FileSource` instead of `UrlSource`:
+
+```tsx
+import { Input, ALL_FORMATS, FileSource } from "mediabunny";
+
+const input = new Input({
+  formats: ALL_FORMATS,
+  source: new FileSource(file), // File object from input or drag-drop
+});
+
+const durationInSeconds = await input.computeDuration();
+```
+
+## Using with staticFile in Remotion
+
+```tsx
+import { staticFile } from "remotion";
+
+const duration = await getVideoDuration(staticFile("video.mp4"));
+```