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-voice/SKILL.md

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+---
+name: minimax-voice
+description: >
+  Synthesize spoken voice from text via the MiniMax TTS API. Use when the user wants
+  speech, narration, voice-over, audio book, or to hear a line read aloud. Trigger
+  on phrases like "say this", "voice this", "speak", "TTS", "read aloud", "narrate".
+allowed-tools: Bash(minimax-gen voice *), Bash(minimax-gen --help), Bash(mkdir *), Bash(ls *), Bash(test *), Bash(file *), Read
+---
+
+# /minimax-voice — Text-to-Speech
+
+Generate an MP3 (or other audio format) from text using the MiniMax TTS API.
+
+## CLI
+
+```bash
+minimax-gen voice "Hello, world." --out /tmp/hello.mp3
+minimax-gen voice "Greetings, traveller." --out /tmp/greeting.mp3 \
+  --voice English_expressive_narrator --emotion calm --speed 1.1
+```
+
+The CLI is at `~/dev/claude/gamedev/minimax-gen/bin/minimax-gen` (or any path the user has on `$PATH`).
+
+## Pick the voice
+
+`t2a_v2` offers 300+ voices. A few useful defaults:
+
+| Voice ID | Tone |
+|---|---|
+| `English_expressive_narrator` | warm, narrative (default) |
+| `English_Graceful_Lady` | calm, feminine |
+| `English_PassionateWarrior` | strong, dramatic |
+| `English_Comedian` | upbeat, playful |
+
+For the full list, the API model `speech-2.8-hd` exposes them via the docs.
+
+## Audio format
+
+Default: `mp3` 32 kHz 128 kbps mono. Other formats: `pcm`, `flac`, `wav`, `opus`.
+
+## After the call
+
+1. Show the user the path written and the `trace_id` from the sidecar `.meta.json`.
+2. Suggest reasonable next steps (preview, regenerate with different emotion).
+3. Do NOT print the contents of the meta JSON to the chat — point at the file.
+
+## Never do
+
+- Never echo, log, or commit the contents of `~/.claude-secrets/minimax-auth-token`.
+- Never pass the token on a command line — the CLI reads it from the file directly.
+- Never write the token to any other file, even a temp file.
+
+## Reference
+
+Full option list: `minimax-gen voice --help`