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-image/SKILL.md

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+---
+name: minimax-image
+description: >
+  Generate one or more images from a text prompt via the MiniMax image API.
+  Use when the user wants an illustration, picture, logo, concept art, sprite,
+  icon, or visual. Trigger on phrases like "draw", "generate an image",
+  "create a picture", "make a sprite", "render", "show me what X looks like".
+allowed-tools: Bash(minimax-gen image *), Bash(minimax-gen --help), Bash(mkdir *), Bash(ls *), Bash(test *), Bash(file *), Read
+---
+
+# /minimax-image — Image Generation
+
+Generate images from a text prompt. Single image or batch.
+
+## CLI
+
+```bash
+# Single image
+minimax-gen image "A castle on a hill at sunset, painterly" \
+  --aspect-ratio 16:9 \
+  --out /tmp/castle.png
+
+# Multiple images into a directory
+minimax-gen image "A red apple, studio lighting" \
+  --out /tmp/apples/ --n 4 --aspect-ratio 1:1
+
+# Wider aspect for landscape scenes
+minimax-gen image "Mountain valley at dawn, fog" \
+  --aspect-ratio 21:9 --out /tmp/valley.png
+```
+
+The CLI is at `~/dev/claude/gamedev/minimax-gen/bin/minimax-gen`.
+
+## Aspect ratios
+
+`1:1` (default), `16:9`, `4:3`, `3:2`, `2:3`, `3:4`, `9:16`, `21:9`.
+
+Choose based on the use case:
+- Sprites / icons → `1:1`
+- Wallpapers / backgrounds → `16:9` or `21:9`
+- Portraits / character → `2:3` or `9:16`
+
+Or pass `--width` and `--height` (both must be set, divisible by 8, 512–2048).
+
+## Output format
+
+The CLI writes whatever format the API returns (typically JPEG). The `--out`
+suffix is corrected to match (`/tmp/castle.png` written as `/tmp/castle.jpg` if
+the API returns JPEG). A sidecar `.meta.json` carries the prompt, trace_id,
+and source URL.
+
+## Tips
+
+- `--prompt-optimizer` lets the API rewrite the prompt for better results.
+- `--seed N` makes the result reproducible.
+- URLs from the API expire in 24h — the CLI downloads the bytes so the file is
+  yours to keep.
+
+## After the call
+
+1. Show the path(s) written and the `trace_id` from the sidecar.
+2. Suggest variations (different aspect, seed, prompt-optimizer on).
+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 image --help`