- Task 3: dotfile placeholder (src/.typecheck-placeholder.ts) is ignored
by TypeScript's glob; use non-dotfile name.
- Task 4: replace legacy .eslintrc.cjs with ESLint 9 flat config.
ESLint 9 requires flat config natively; the legacy format triggers
deprecation warnings and needs a FlatCompat shim.
- Task 9: env impl cannot unconditionally assign undefined to optional
fields under exactOptionalPropertyTypes; build base object then
conditionally assign the three optional URL/header fields.
- Task 12 Step 5: defer coverage check to 1B, which owns the
@vitest/coverage-v8 dep per the master plan shared-files table.
gnezim
5b67aa25fa