fix: redact credentials from agent status messages

[Moviw]

Summary

Redact sensitive HTTP header values before agent status messages are sent to a workspace.

• sanitize status content centrally in BaseAdapter.sendStatus()
• redact Authorization, *-Token, and *-Key header values
• preserve non-sensitive headers and surrounding command text
• cover direct helper behavior and the shared status-send path

Testing

• node --test test/adapter-utils.test.js — 6 passed
• Node syntax checks passed for the modified source and test files
• full agent-connector suite: 450 passed; unrelated existing Windows/environment-dependent tests failed
• lint could not run because the package's existing lint script references an unavailable eslint executable

Fixes #437

[vercel]

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