[DO NOT MERGE] feat: abandon heartbeat

[zfields]

No description provided.

[Copilot]

Pull Request Overview

This PR modifies the heartbeat functionality to allow the heartbeat callback to signal when a request should be abandoned. The changes convert the heartbeat function from returning void to returning a boolean value indicating whether to abandon the current request.

Key changes:

• Modified heartbeat function signature to return boolean instead of void
• Updated heartbeat callback handling to check return value and break from retry loop when true
• Added documentation explaining the new return value behavior

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
note.h	Updated heartbeat function typedef to return bool instead of void
n_lib.h	Updated internal heartbeat function declaration to return bool
n_hooks.c	Modified heartbeat implementation to return callback result or false
n_request.c	Added logic to check heartbeat return value and break retry loop

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[zfields]

renamed branch