feat(session): maintain canonical task state

shared/hooks/scripts/Record-Compact.ps1

@@ -4,4 +4,5 @@ $root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
 $stateDir = Join-Path $root '.ai-session'
 New-Item $stateDir -ItemType Directory -Force | Out-Null
 ('{"event":"compact","timestamp":"' + (Get-Date).ToUniversalTime().ToString('o') + '"}') | Add-Content (Join-Path $stateDir 'telemetry.jsonl')
-exit 0
+& python (Join-Path $PSScriptRoot 'session-state.py') --hook
+exit $LASTEXITCODE