don't update LastInteraction when only git hooks were triggered

[Soph]

I noticed a lot of sessions still sitting around locally. And what jumped out was that all of them were constantly updated. Turns out that the commit hooks kept looking at older sessions - which is fine - but also kept bumping LastInteractionTime which made them never going to be cleaned up. Now a commit isn't really an interaction in a session, so let's not do this in this case.

[cursor]

PR Summary

Low Risk
Low risk: restricts LastInteractionTime updates to explicit session lifecycle/turn events, but could affect any logic that relied on commits keeping sessions “active” for cleanup or UX purposes.

Overview
Git commit (EventGitCommit) transitions no longer include the ActionUpdateLastInteraction side effect in PhaseIdle, PhaseActive, or PhaseEnded, so post-commit hooks won’t bump LastInteractionTime.

Tests are updated accordingly, including ApplyTransition coverage (condense/discard actions no longer imply a last-interaction update, and the handler-error test now only asserts the phase is still applied).

^{Written by Cursor Bugbot for commit ba20a2f. Configure here.}

[Copilot]

Pull request overview

This PR adjusts the session phase state machine so that git commit hooks no longer count as “user interaction” and therefore do not keep sessions alive by updating LastInteractionTime, enabling stale-session cleanup to work as intended.

Changes:

• Remove ActionUpdateLastInteraction from EventGitCommit transitions across IDLE/ACTIVE/ENDED phases.
• Update unit tests to reflect the new transition action sets and updated expectations around LastInteractionTime.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
cmd/entire/cli/session/phase.go	Removes ActionUpdateLastInteraction from EventGitCommit transition results so commits don’t refresh session “activity”.
cmd/entire/cli/session/phase_test.go	Updates transition/apply-transition tests to match the new GitCommit behavior and expectations.

[khaong]

LGTM. Git commit hooks only ever self-transition on phase, so removing ActionUpdateLastInteraction from EventGitCommit paths is correct and complete. Also pushed a small fix for the stale comment on LastInteractionTime in state.go.