feat: add rlmx config command for global settings

[namastex888]

Summary

• rlmx config set/get/list/delete/path for managing ~/.rlmx/settings.json
• API keys injected into process.env at startup — no shell exports needed
• Sensitive keys always masked in output (get + list)
• Type coercion for booleans and numbers
• File permissions: 0600

Test plan

• 158/158 tests pass (16 new)
• rlmx config set GEMINI_API_KEY <key> → saves, masked in output
• rlmx config get GEMINI_API_KEY → shows masked value
• rlmx "query" works with key from settings.json (no env export)
• File permissions are 600

Wish: cli-settings

[gemini-code-assist]

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