effortLevel "medium" in settings.json not respected on Opus 4.7 session start (falls back to xhigh)

Description

Persisted effortLevel: "medium" in ~/.claude/settings.json is not applied on new Opus 4.7 sessions — they start at xhigh instead.

Repro

1. Set in ~/.claude/settings.json:

``json
{ "effortLevel": "medium" }
``

1. Start a fresh Claude Code session on Opus 4.7
2. Observed effort: xhigh
3. Expected effort: medium

Investigation

Ruled out all override sources:

• No managed-settings.json (checked /Library/Application Support/ClaudeCode/, /etc/claude-code/, ~/.claude/)
• No project-level .claude/settings.json in CWD
• ~/.claude/settings.local.json contains only permissions, no effortLevel
• No relevant env vars (CLAUDE_CODE_*, ANTHROPIC_*, EFFORT*)
• No override in ~/.claude.json state file

Potentially related flag found in ~/.claude.json:

"unpinOpus47LaunchEffort": true

This suggests Opus 4.7 may have launch-effort logic that bypasses the persisted effortLevel.

Environment

• CLI version: 2.1.112 (native install)
• Platform: macOS (Darwin 25.5.0)
• Model: Opus 4.7 (claude-opus-4-7)