Enable the TypeScript strict flag `noUncheckedIndexedAccess` which ensures
that indexed access (arrays, Record types) includes `| undefined` in the
result type, catching potential runtime errors at compile time.
Current state:
- 493 pre-existing type errors (before this flag)
- ~234 additional errors introduced by this flag
- Errors should be fixed progressively, prioritizing features/ and services/
- Pattern: use optional chaining (value?.) or null checks (if (value != null))
This flag was previously commented out with a TODO. Enabling it now ensures
new code is written safely, even as existing errors are addressed over time.
Addresses audit finding: debt item 10 (TypeScript strictness).
Co-authored-by: Cursor <cursoragent@cursor.com>
