[cc] add tsconfig.json for explicit strict mode

[anipotts]

Source: Apr 2026 conventions audit

Problem

`plugins/cc/` has no `tsconfig.json`. bun runs the .ts files directly without one, so it works — but:

1. IDE/editors fall back to defaults that may not match bun's runtime
2. `bunx tsc --noEmit` requires CLI flags every time
3. Pre-commit hooks / CI can't easily enforce strict mode
4. New contributors can't tell what TS dialect/options the project expects

Fix

`plugins/cc/tsconfig.json`:

```json
{
"compilerOptions": {
"target": "ES2022",
"module": "ESNext",
"moduleResolution": "bundler",
"allowImportingTsExtensions": true,
"resolveJsonModule": true,
"skipLibCheck": true,
"strict": true,
"noUncheckedIndexedAccess": true,
"noImplicitOverride": true,
"exactOptionalPropertyTypes": true,
"types": ["bun-types"]
},
"include": ["**/*.ts"],
"exclude": ["node_modules", "dist"]
}
```

Acceptance criteria

• `bunx tsc --noEmit` passes from `plugins/cc/` with no extra flags
• Strict mode catches existing issues (or none, if already clean)
• CI runs the check

[github-actions]

@claude please triage this issue per .github/AI_REVIEW_RUBRIC.md (issue-triage section).