Add minimax media skills and ABOUT.md; end-session/reflect updates; MiniMax-M3.1-Flash note in minimax-mesh

Includes the minimax-mesh switch to M3.1-Flash-Preview at effort low,
README/reflection-state refresh, and removal of two old session logs.

skills/minimax-video/SKILL.md

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+---
+name: minimax-video
+description: >
+  Generate a short video clip from a text prompt or an image via the MiniMax
+  video API. Use when the user wants video, a moving clip, animation, or a
+  short film. Trigger on phrases like "make a video", "animate this", "film",
+  "create a clip", "video of X".
+allowed-tools: Bash(minimax-gen video *), Bash(minimax-gen --help), Bash(mkdir *), Bash(ls *), Bash(test *), Bash(file *), Read
+---
+
+# /minimax-video — Video Generation
+
+Generate a short video clip. Asynchronous — submit, poll, download.
+
+## CLI
+
+```bash
+# Text-to-video
+minimax-gen video --prompt "A paper plane gliding over a city" \
+  --duration 6 --resolution 768P \
+  --out /tmp/plane.mp4
+
+# Image-to-video (animate a still)
+minimax-gen video --image-url https://example.com/cover.jpg \
+  --out /tmp/anim.mp4
+```
+
+The CLI is at `~/dev/claude/gamedev/minimax-gen/bin/minimax-gen`.
+
+## Models and resolutions
+
+| Model | Resolutions |
+|---|---|
+| `MiniMax-Hailuo-2.3` (default) | `768P`, `1080P` |
+| `MiniMax-Hailuo-2.3Fast` | `768P`, `1080P` (cheaper, faster) |
+| `MiniMax-Hailuo-02` | legacy |
+
+`720p` is rejected — use `768P` or `1080P` (capitalised).
+
+## Duration
+
+Common: 6 seconds. The default is 6.
+
+## Timeouts
+
+Async work — total wall-clock can be 1–5 minutes. Default `--timeout` is 900s.
+`--poll-interval` controls how often we ask the server for status (default 5s).
+
+## After the call
+
+1. Show the path written and the `task_id` from the sidecar `.meta.json`.
+2. Note the resolution (`video_width` × `video_height`) and file size.
+3. Do NOT print the meta JSON — point at the file.
+
+## Never do
+
+- Never echo, log, or commit the contents of `~/.claude-secrets/minimax-auth-token`.
+
+## Reference
+
+Full option list: `minimax-gen video --help`