Remove daf git add-comment command — replace with gh/glab skills

[itdove]

Background

Investigation concluded that daf git add-comment is a thin wrapper with zero session integration. It only:

1. Detects platform (GitHub vs GitLab) from git remote
2. Calls client.add_comment(issue_key, comment)
3. Which under the hood runs gh issue comment or glab issue note

The gh-cli and glab-cli skills already teach Claude the raw CLI equivalents.

Files to Remove

• devflow/cli/commands/git_add_comment_command.py (93 lines)
• tests/test_git_add_comment_command.py

Files to Modify

• devflow/cli/main.py — remove add-comment subcommand registration
• devflow/cli/commands/git_commands.py — remove import if present
• .claude/skills/daf-git/SKILL.md — remove daf git add-comment section, add note to use gh issue comment / glab issue note directly

Skill-Based Replacement

The gh-cli skill already documents:

gh issue comment 123 --body "Work in progress"

The glab-cli skill already documents:

glab issue note 123 -m "Work in progress"

The daf-git skill should be updated to reference these directly.

Risk

Low — no session integration, no downstream dependencies.

• git_add_comment_command.py removed
• Test file removed
• CLI registration removed from main.py
• daf-git skill updated with gh/glab replacements
• All existing tests pass

[itdove]

Dependencies

Blocked by: nothing
Blocks: nothing

Execution phase: Phase 1A (independent, start anytime)

Related: Part of daf git command cleanup (#383-#387)