Stabilize the maintenance launcher across upgrades

[nyldn]

What changed

• replace the v0.1.4 generic env launch item with an owner-only, product-owned launcher under Application Support
• keep the exact AI Optimizer executable only in launchd environment state
• write the launcher atomically at mode 0700 and reject symlinked targets
• preserve migration from legacy v0.1.4 plists and explicit opt-in scheduling
• bump to v0.1.5 and correct the v0.1.4 changelog claim

Live lifecycle evidence

• the generic env launch item was removed by macOS Background Task Management after about five minutes
• the product-owned launcher remained loaded beyond that interval
• a synthetic Homebrew revision upgrade changed the keg from 0.1.4 to 0.1.4_1, removed the old Cellar directory, and the launchd job remained loaded

Verification

• 39 tests, 158 assertions, 0 failures
• system Ruby syntax and install/uninstall round trip pass
• deterministic release archive matches across two builds
• Gitleaks scanned full history with no findings
• Claude Fable 5 final review: PASS

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 52172995-282f-4bcc-83ea-861fc9263f79

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