feat: support session options

[ao-anam]

Summary by cubic

Adds support for passing options to session-related calls so consumers can control behavior like expiration and persistence. Existing defaults remain to avoid breaking changes.

• New Features
  • Session APIs now accept an options object (e.g., expiry, persistence).
  • Options are merged with safe defaults.
  • Backward compatible; existing usage requires no changes.

^{Written for commit 2c63120. Summary will update on new commits.}