fix(gateway): resolve TypeError in suspend_recently_active on startup

[ystyleb]

Problem

The suspend_recently_active() method in gateway/session.py fails on gateway startup with:

TypeError: '>=' not supported between instances of 'datetime.datetime' and 'float'

This error appears in logs as:

WARNING gateway.run: Session suspension on startup failed: '>=' not supported between instances of 'datetime.datetime' and 'float'

Root Cause

Introduced in commit 2d328d5c (PR #7536). The method calculates cutoff using time.time() which returns a float, then compares it with entry.updated_at which is a datetime object:

cutoff = _time.time() - max_age_seconds  # → float
if not entry.suspended and entry.updated_at >= cutoff:  # datetime >= float → TypeError

Fix

Changed the cutoff calculation to use _now() and timedelta, matching the pattern used elsewhere in the file (e.g., list_sessions()):

cutoff = _now() - timedelta(seconds=max_age_seconds)

Verification

• The fix ensures type consistency (both are datetime objects)
• Matches the pattern in list_sessions() method (line 928)
• Tested locally - no TypeError on gateway restart
• No other similar issues found in the codebase

[ystyleb]

Closing — this was already fixed in commit 50d86b3 (PR #7981). The fix is identical to what I proposed. Thanks!