docs(agents): update formatted-commit flag docs

Amolith created

Replace duplicate --amend flag with --add flag to stage all modified
files before committing.

Assisted-by: GLM-4.6 via Crush

Change summary

dot_config/AGENTS.md | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

Detailed changes

dot_config/AGENTS.md 🔗

@@ -77,7 +77,8 @@ Create/amend commits exclusively using `formatted-commit`. Try to use it normall
 -m --message Commit message (required)
 -b --body Commit body (optional)
 -T --trailer Trailer in 'Sentence-case-key: value' format (optional, repeatable)
--a --amend Amend the previous commit (optional)
+-a --add Stage all modified files before committing (optional)
+--amend Amend the previous commit (optional)
 -h --help
 </formatted-commit_flags>
 <formatted-commit_example>