feat: add Claude Opus 5 model

[wizzoapp]

What changed

• add Claude Opus 5 to the server catalog and backend, replacing the advertised Opus 4.8 entry
• expose Opus 5 effort and fast mode with its fixed 1M context window
• migrate new and unstarted Opus 4.8 selections to the newest supported native Opus while keeping exact established 4.8 sessions runnable
• share version-gated and retired Claude slugs across backend settings and browser picker merges
• enforce version gates and retired-model pruning across live, pending, hydrated, MCP, and transient-failure paths

Why

Opus 5 needs to be selectable in web and desktop and runnable by the backend today. The dispatched SHA c3e8fb6 was verified after refreshing upstream and changes only Macroscope review-agent frontmatter; the actual upstream product patch is 41a430a from upstream PR 4472. This hotfix applies that product patch plus the minimum fork-specific replacement and compatibility behavior required by the explicit decision that Opus 5 replaces Opus 4.8.

This fresh PR supersedes PRs 242 through 245 from the exact same branch and final factory-gated head. Earlier PRs completed their Codex review allowances; every finding was fixed, replied to, and resolved.

Validation

• workspace typecheck passed
• production web build and output assertion passed
• server package: 2,615 tests passed, 22 skipped
• shared package: 304 tests passed
• web package: 1,680 tests passed; one unrelated timeline test timed out and passed all 18 tests on immediate isolated rerun
• directly affected browser selection/session tests: 89 passed
• focused model and MCP routing tests: 184 passed
• isolated browser picker proof: Claude Opus 5 visible/selectable; Claude Opus 4.8 absent
• every commit passed the factory static checks and clean Codex autoreview gate

The four-provider E2E matrix is intentionally skipped. Post-merge deployment still requires the controlled deploy, external probe, and a real Opus 5 turn.

[chatgpt-codex-connector]

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[adamfgr]

Auto-approved by wizzo-approve: all policy conditions verified against HEAD d9d9f2e.