[Caps] Annotate remaining 18 plugins with caps metadata

[passwordless-OTP]

Annotate all remaining plugins with caps metadata so they appear in caps discovery.

Plugins to Annotate

Cloud (6)

• aws
• gcloud
• flyctl
• doctl (partial - needs more)

DevOps (3)

• git
• docker (partial - needs more)
• gh (partial - needs more)

Package Managers (7)

• npm
• pnpm
• poetry
• uv
• cargo
• make
• just

AI (4)

• claude-code
• kimi-cli
• codex-cli
• gemini-cli

Format

# caps:category=<category>
# caps:desc=<description>
alias <name>='<command>'

Acceptance Criteria

• All plugins have at least 5 annotated aliases
• caps <service> works for each
• Categories are consistent

/label enhancement,caps
/milestone v0.2