fix(lazygit): update commit message generation system prompt

The system prompt was updated to include "no fences" directive to
ensure commit messages are output without code fence markers.
Additionally,
the prompt now requests that the subject of the change be included in
parentheses when using conventional commit format with a specified type.

Author: pedropombeiro

.config/lazygit/config.yml

@@ -634,8 +634,8 @@ customCommands:
             description: "Adding missing tests or correcting existing tests"
             value: "test"
     command: |
-      system_prompt="Generate git commit messages. Output only the raw message, no commentary."
-      prompt="Generate a commit message for the staged changes: a subject line (max 72 chars), blank line, then a body explaining what and why (wrap at 72 chars).{{ if .Form.Type }} Use conventional commit format with type: {{ .Form.Type }}.{{ end }}"
+      system_prompt="Generate git commit messages. Output only the raw message, no commentary, no fences."
+      prompt="Generate a commit message for the staged changes: a subject line (max 72 chars), blank line, then a body explaining what and why (wrap at 72 chars).{{ if .Form.Type }} Use conventional commit format with type: {{ .Form.Type }}, and try to include the subject of the change in parenthesis.{{ end }}"
       msg=$(claude --model haiku --output-format json --system-prompt "$system_prompt" -p "$prompt" \
         --tools "Bash,Read" | jq -r '.result')
       echo "$msg"