minimax skills: move to MiniMax-M3.1-Flash-Preview with effort levels

ask-minimax* run at effort max; wrapper-based skills document their
default effort (explore medium, ci-triage low, review max).

skills/ask-minimax/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: ask-minimax
 description: >
-  Delegate a file-heavy task to a MiniMax M3 sub-session. The sub-session reads and
+  Delegate a file-heavy task to a MiniMax M3.1-Flash sub-session. The sub-session reads and
   writes files directly; only a concise result returns to this session. Saves context and
   Anthropic tokens. Pass a task description as arguments, or run without args to be prompted.
 user_invocable: true
@@ -12,7 +12,7 @@ allowed-tools: Read, Write, Bash(ask-minimax-run *), Bash(date *), Bash(rm -f *)
 
 # /ask-minimax Skill
 
-Offload a file-heavy task to a MiniMax M3 sub-session. Large file contents stay out of this session — only the task prompt and a concise result summary flow back.
+Offload a file-heavy task to a MiniMax M3.1-Flash sub-session. Large file contents stay out of this session — only the task prompt and a concise result summary flow back.
 
 ## Pre-gathered context
 
@@ -91,7 +91,7 @@ Execute via Bash (substitute `<TS>` with the actual value):
 
 ```bash
 ask-minimax-run \
-  --model MiniMax-M3 \
+  --model MiniMax-M3.1-Flash-Preview --effort max \
   --allowedTools "Read,Write,Edit,Glob,Grep" \
   --permission-mode acceptEdits \
   -p "$(cat /tmp/ask-minimax-<TS>-prompt.txt)" \