[codex] Redact agent task logs with hash correlation

[Dreamstore2046]

Summary

Closes #241.

Replaces raw agent task logging with hash-based correlation and debug-only redacted task text:

• logs taskHash plus suspicious at info level
• logs the redacted full task at debug level for support investigations
• redacts known care recipient/caregiver names and known medication names before debug logging
• keeps token/secret redaction from the existing shared redactor
• adds Vitest coverage for the hash-only info log and redacted debug task text

Validation

• npm test -- agent/__tests__/task-log.test.ts shared/__tests__/redact.test.ts
• npx tsc --noEmit --target ES2022 --module ESNext --moduleResolution bundler --allowImportingTsExtensions --esModuleInterop --allowSyntheticDefaultImports --strict --skipLibCheck --types node,vitest agent/task-log.ts agent/__tests__/task-log.test.ts shared/redact.ts shared/__tests__/redact.test.ts
• git diff --check

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