feat: Update local agent documentation to reflect changes in user_id and session_id handling; add marketing strategy document; update skills-lock.json with new Remotion best practices; update website subproject commit.

.claude/skills/remotion-best-practices/rules/silence-detection.md

@@ -0,0 +1,71 @@
+---
+name: silence-detection
+description: Adaptive silence detection for video/audio files using FFmpeg loudnorm and silencedetect
+metadata:
+  tags: silence, detection, trimming, ffmpeg, loudnorm, audio
+---
+
+# Adaptive Silence Detection
+
+Detect silent segments in video or audio files.
+
+Requires FFmpeg — see [ffmpeg.md](./ffmpeg.md) for how to invoke it in Remotion projects.
+
+## Step 1: Measure loudness with `loudnorm`
+
+Use the `loudnorm` filter in JSON mode to get the EBU R128 integrated loudness and gating threshold for each file:
+
+```bash
+npx remotion ffmpeg -i public/video.mov -map 0:a -af loudnorm=print_format=json -f null /dev/null
+```
+
+As output you will get:
+- `input_i`: Integrated loudness (dB) — the overall perceived volume
+- `input_thresh`: EBU R128 gating threshold (dB) — the level below which audio is considered too quiet to count toward loudness measurement
+
+## Step 2: Detect silences using adaptive threshold
+
+Pass the `input_thresh` value from step 1 as the `noise` parameter to `silencedetect`:
+
+```bash
+npx remotion ffmpeg -i public/video.mov -map 0:a -af "silencedetect=noise=${THRESH}dB:d=0.5" -f null /dev/null
+```
+
+Parameters:
+- `noise`: The threshold below which audio is considered silent. Use `input_thresh` from step 1.
+- `d`: Minimum silence duration in seconds. `0.5` is a good default.
+
+## Interpreting the output
+
+The filter outputs pairs of `silence_start` and `silence_end` timestamps:
+
+```
+[silencedetect] silence_start: 0
+[silencedetect] silence_end: 2.241021 | silence_duration: 2.241021
+[silencedetect] silence_start: 38.77425
+[silencedetect] silence_end: 39.619604 | silence_duration: 0.845354
+```
+
+## Identifying leading and trailing silence
+
+- **Leading silence**: Consecutive silence segments starting at or near 0. If the first `silence_start` is > 0.5s, there is no leading silence.
+- **Trailing silence**: The last silence segment that extends to (or near) the end of the file. Compare the last `silence_end` with the file's total duration.
+
+When multiple silences are nearly contiguous at the start or end (gap < 0.2s), treat them as a single leading/trailing silence block.
+
+## Using with Remotion's `<Video>` component
+
+Apply the detected trim points using `trimBefore` and `trimAfter` (values are in frames):
+
+```tsx
+import { Video } from "@remotion/media";
+import { staticFile, useVideoConfig } from "remotion";
+
+const { fps } = useVideoConfig();
+
+<Video
+  src={staticFile("video.mov")}
+  trimBefore={Math.floor(leadingEnd * fps)}
+  trimAfter={Math.ceil(trailingStart * fps)}
+/>
+```