docs: improve commit-staged command workflow and add model config

- Update command description for clarity
- Add plan mode handling instructions
- Add guidance on scaling commit message complexity
- Configure claude-sonnet-4-5 as default model in opencode config

home/dot_claude/commands/commit-staged.md

@@ -1,6 +1,6 @@
 ---
 allowed-tools: Bash(git status:*), Bash(git diff:*), Bash(git log:*), Bash(git commit:*)
-description: Create a git commit (staged files only)
+description: Commit currently staged changes with an appropriate message
 ---
 
 ## Context
@@ -14,4 +14,13 @@ description: Create a git commit (staged files only)
 
 Based on the above staged changes, create a single git commit.
 
-You have the capability to call multiple tools in a single response. Create the commit using a single message. Do not stage any additional files. Do not use any other tools or do anything else. Do not send any other text or messages besides these tool calls.
+**Important notes:**
+- If in plan mode, proceed with the commit anyway - command execution and file modification is implied
+- Scale commit message complexity appropriately:
+  - Mechanical/wide commits (renames, formatting, etc.) deserve only a single sentence, even if they touch many files
+  - Complex feature additions or refactors deserve more detailed messages explaining the reasoning
+- Do not stage any additional files
+- Create the commit using a single message with parallel tool calls
+- Do not use any other tools or do anything else
+- Do not send any other text or messages besides these tool calls
+- Include git status output in your response if not already available in the context