Add anti-slop linting and repository cleanup

[milind-soni]

What changed

• Vendor the anti-slop Oxlint plugin and enable all 15 rules at error severity.
• Add pinned Oxlint dependencies plus pnpm lint and pnpm clean commands.
• Stop tracking generated dist-server output and ignore generated/agent worktree paths.
• Resolve 89 low-risk anti-slop findings without rule suppressions, including safer conditional object construction, preserved inferred types, named return contracts, and clearer mascot silhouette terminology.

Why

The repository had no anti-slop lint boundary, generated server output was committed, and several type annotations discarded useful evidence. This establishes a visible migration baseline and removes generated-file noise from reviews.

Impact

No user-facing behavior change is intended. The lint command is intentionally not a CI gate yet: the first current-main audit found 724 errors and 23 warnings; this pass reduces that to 635 errors and 23 warnings. The remaining boundary parsing and assertion work should be migrated incrementally.

Validation

• pnpm typecheck
• pnpm test -- --reporter=dot — 527 Vitest tests and 12 updater tests passed; 8 skipped
• pnpm check:electron
• node --check scripts/clean.mjs
• pnpm audit --prod — no known vulnerabilities
• git diff --check

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