effortLevel config: 'max' from /effort command not valid in settings.json schema

Bug

/effort max works in-session, but the effortLevel field in settings.json only accepts "low", "medium", "high" per the schema:

"effortLevel": {
  "description": "Persisted effort level for supported models.",
  "type": "string",
  "enum": ["low", "medium", "high"]
}

Setting "effortLevel": "max" in ~/.claude/settings.json is silently ignored and falls back to auto (currently medium) on every new session.

Expected behavior

Either:

1. Add "max" to the schema enum so it matches the /effort command options, OR
2. /effort should only offer values that are valid in the config (low/medium/high)

Steps to reproduce

1. Set "effortLevel": "max" in ~/.claude/settings.json
2. Open a new session
3. Run /effort → shows auto (currently medium) instead of max

Environment

• Claude Code 2.1.92
• macOS (Darwin 25.4.0)
• Affects both CLI and VS Code extension