fix: set _ps_resumed for ASSISTANT_TURN_START after shutdown (#1165)

[microsasa]

Closes #1165

Problem

In _first_pass, the ASSISTANT_TURN_START branch incremented _ps_turn_starts when occurring after a shutdown but never set _ps_resumed = True. This caused in-flight sessions (with an active model turn that hasn't yet produced an ASSISTANT_MESSAGE) to be incorrectly reported as is_active=False with active_model_calls=0, silently discarding the accumulated post-shutdown turn starts.

Fix

Add _ps_resumed = True to the ASSISTANT_TURN_START branch when _shutdowns is non-empty, making it consistent with the USER_MESSAGE and ASSISTANT_MESSAGE branches.

Tests Added

Three regression tests in TestBuildSessionSummaryResumed:

1. test_turn_start_alone_marks_resumed — Shutdown followed by a single ASSISTANT_TURN_START (no ASSISTANT_MESSAGE) → is_active=True, active_model_calls=1
2. test_turn_start_then_assistant_message_marks_resumed — Shutdown followed by ASSISTANT_TURN_START + ASSISTANT_MESSAGE → is_active=True, active_model_calls=1, active_output_tokens=200
3. test_pure_active_session_unaffected_by_turn_start_fix — Session with no shutdown → is_active=True with correct total counters (no regression)

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[Copilot]

Pull request overview

Fixes resumed-session detection in copilot_usage parsing so that an assistant.turn_start occurring after a shutdown correctly marks the session as resumed/active (preventing post-shutdown in-flight model calls from being dropped in summaries).

Changes:

• Mark _ps_resumed = True when ASSISTANT_TURN_START occurs after a shutdown in _first_pass.
• Add regression tests covering turn-start-only and turn-start+assistant-message post-shutdown behavior, plus a no-shutdown regression test.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/copilot_usage/parser.py	Ensures post-shutdown assistant.turn_start sets the resumed flag so is_active/active_model_calls are computed correctly.
tests/copilot_usage/test_parser.py	Adds regression tests to prevent this resumed-detection bug from returning and to ensure no-shutdown behavior is unchanged.