opus-4-7-migration

# Opus 4.7 Migration Scanner Identify patterns in a repository that break or silently degrade when the Anthropic platform routes to Opus 4.7. Produces a categorized report with file:line references so a maintainer can plan a scoped migration PR rather than chasing symptoms after the fact. ## Reference Files | File | Contents | Load When | | ----------------------------- | ------------------------------------------------------------- | ---------------------------------- | | `scripts/scan.py` | Repo scanner producing a categorized findings report | Always | | `references/migration-map.md` | Per-category migration actions with before/after code samples | When a category returns findings | ## When to Run - Before upgrading a service or agent stack to Opus 4.7 - When an existing Anthropic SDK integration starts returning errors after the platform rolled out 4.7 - Periodically in a CI or weekly audit to prevent drift as the repo grows - Before publishing a package that downstream users will run against 4.7 ## Scope — What the Scanner Flags The scanner is intentionally narrow. It reports three categories of **deterministic** patterns plus two **heuristic** categories that require manual review. ### Category A — Fixed-budget Extended Thinking (deterministic) Opus 4.7 does not support Extended Thinking with a fixed `budget_t...