fix(cli): avoid WP-CLI global option collisions

[chubes4]

Summary

• rename command-local user selectors to explicit target or owner options
• rename chat and email context inputs to domain-specific options
• rely on WP-CLI global quiet handling instead of redeclaring --quiet
• update examples, documentation, parsing, and collision coverage

Verification

• php tests/cli-global-options-smoke.php
• PHP syntax checks for all changed command and test files

Closes #3439.

AI assistance

OpenAI GPT-5.6 Sol via OpenCode inventoried the WP-CLI collisions, implemented the domain-specific option names and coverage, and assisted with review and verification. Chris Huber directed the work and reviewed the resulting candidate.