PR_BODY.md

Title: Add verbose CLI flag (-v) with redacted HTTP logging

Short description:

• Add a global -v/--verbose CLI flag to enable redacted HTTP request/response logging to help debug interactions with the Databus and Vault.

What changed:

• Add global -v/--verbose option to databusclient CLI and propagate it to API calls.
• Implement redacted HTTP logging helper (redacts Authorization and X-API-KEY headers).
• Instrument download and Vault token exchange flows to print HTTP request/response details when -v is enabled.
• Add unit tests ensuring verbose logs are printed and sensitive tokens are redacted.
• Update README.md and add a CHANGELOG.md entry.

Why:

• Provides safe, actionable debugging output for issues involving HTTP communication and auth problems without exposing secrets.

Security note:

• Authorization and API-key headers are redacted in verbose output. Avoid enabling verbose output in public CI logs.

Closes #27