feat: upgrade ask-minimax skills from MiniMax-M2.7 to M3

M3 is now available on both api.minimax.io and api.minimaxi.chat
and has been verified working. Bump --model flag and all prose
references in both skills.

Claude-Session: https://claude.ai/code/session_01XtWRazqRbMnMRa4iV3zbVx

skills/ask-minimax-with-context/SKILL.md

@@ -3,7 +3,7 @@ name: ask-minimax-with-context
 description: >
   Walk CONTEXT.md and CLAUDE.md files from a folder up to the git root, assemble them into
   a context bundle via shell redirects (contents never enter this session), then delegate a
-  one-line question to MiniMax. Saves context and Anthropic tokens even for simple questions.
+  one-line question to MiniMax M3. Saves context and Anthropic tokens even for simple questions.
   Usage: /ask-minimax-with-context <folder-path> <question>
 user_invocable: true
 allowed-tools: Read, Write, Bash(ask-minimax-run *), Bash(date *), Bash(rm -f *), Bash(test *), Bash(pwd), Bash(bash *)
@@ -145,7 +145,7 @@ Substitute `TS` with the actual timestamp integer before running:
 
 ```bash
 ask-minimax-run \
-  --model MiniMax-M2.7 \
+  --model MiniMax-M3 \
   --allowedTools "Read,Write" \
   --dangerously-skip-permissions \
   -p "$(cat /tmp/ask-minimax-TS-prompt.txt)" \