fix(copilot): set x-initiator per turn so user prompts bill as premium requests (salvage #4097) (#58544)

* fix(cli): set correct x-initiator header per Copilot turn

copilot_default_headers() always hardcoded x-initiator: agent, but
GitHub Copilot billing requires "user" for user-initiated prompts and
"agent" for tool/follow-up calls. This caused premium requests to never
be consumed correctly, risking billing issues or account bans.

Adds is_agent_turn param to copilot_default_headers() and injects
extra_headers={"x-initiator": "user"} on the first API call of each
user turn when targeting Copilot URLs. The flag flips to False after
injection so subsequent calls (tool use, streaming fallback) default
back to "agent".

Fixes #3040

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore(release): add AUTHOR_MAP entry for @tjp2021 (PR #4097 salvage)

---------

Co-authored-by: Tim <tim@iteachyouai.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

hermes_cli/models.py

@@ -2783,7 +2783,7 @@ def _payload_items(payload: Any) -> list[dict[str, Any]]:
     return []
 
 
-def copilot_default_headers() -> dict[str, str]:
+def copilot_default_headers(*, is_agent_turn: bool = True) -> dict[str, str]:
     """Standard headers for Copilot API requests.
 
     Includes Openai-Intent and x-initiator headers that opencode and the
@@ -2791,13 +2791,13 @@ def copilot_default_headers() -> dict[str, str]:
     """
     try:
         from hermes_cli.copilot_auth import copilot_request_headers
-        return copilot_request_headers(is_agent_turn=True)
+        return copilot_request_headers(is_agent_turn=is_agent_turn)
     except ImportError:
         return {
             "Editor-Version": COPILOT_EDITOR_VERSION,
             "User-Agent": "HermesAgent/1.0",
             "Openai-Intent": "conversation-edits",
-            "x-initiator": "agent",
+            "x-initiator": "agent" if is_agent_turn else "user",
         }