chore(lint): enforce anti-slop rules

[HazAT]

JavaScript and TypeScript linting now enforces the vendored anti-slop rules across the app, worker, video processor, migration tooling, and tests. The existing codebase is migrated to that policy with explicit JSON boundary parsing and narrower domain contracts, preserving current user-facing behavior while making low-evidence casts, broad input types, runtime representation checks, and conditional omission patterns fail future checks.

Reviewers should start with vite.config.ts and src/shared/json.ts to establish the policy and parsing model, then focus on migration reconciliation and video processing where replacing open dictionaries and assertion chains required the most structural change. The plugin is intentionally project-owned and its Oxlint runtime is pinned; the main review risk is whether the stricter boundary parsing exactly preserves accepted payloads and processor results.

[cursor]

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