refactor: extract shared buildBaseOptions to eliminate duplication

Move the common TRUSTIFY_DA_* options construction from stackAnalysis.ts
and batchAnalysis.ts into a shared buildBaseOptions() helper in
exhortServices.ts. Both callers now spread the base options and only
add their specific overrides (token, batch settings).

Also regenerate package-lock.json minimally from upstream to avoid
unnecessary churn from npm version differences.

Implements TC-3864

Assisted-by: Claude Code

Author: ruromero