feat(cursor): Add Windows PowerShell support for Cursor hooks

Complete Windows parity with bash scripts:
- Create 7 PowerShell scripts mirroring bash functionality
- Update installer to detect platform and install appropriate scripts
- Generate platform-specific hooks.json with PowerShell invocation
- Add enterprise support for Windows (ProgramData/Cursor)
- Update findCursorHooksDir to check for both .sh and .ps1
- Add comprehensive Windows documentation to STANDALONE-SETUP.md

Scripts added: common.ps1, session-init.ps1, context-inject.ps1,
save-observation.ps1, save-file-edit.ps1, session-summary.ps1, user-message.ps1

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cursor-hooks/session-init.ps1

@@ -0,0 +1,79 @@
+# Session Initialization Hook for Cursor (PowerShell)
+# Maps to claude-mem's new-hook functionality
+# Initializes a new session when a prompt is submitted
+#
+# NOTE: This hook runs as part of beforeSubmitPrompt and MUST output valid JSON
+# with at least {"continue": true} to allow prompt submission.
+
+$ErrorActionPreference = "SilentlyContinue"
+
+# Source common utilities
+$commonPath = Join-Path $PSScriptRoot "common.ps1"
+if (Test-Path $commonPath) {
+    . $commonPath
+} else {
+    # Fallback - output continue and exit
+    Write-Output '{"continue": true}'
+    exit 0
+}
+
+# Read JSON input from stdin with error handling
+$input = Read-JsonInput
+
+# Extract common fields with safe fallbacks
+$conversationId = Get-JsonField $input "conversation_id" ""
+$generationId = Get-JsonField $input "generation_id" ""
+$prompt = Get-JsonField $input "prompt" ""
+$workspaceRoot = Get-JsonField $input "workspace_roots[0]" ""
+
+# Fallback to current directory if no workspace root
+if (Test-IsEmpty $workspaceRoot) {
+    $workspaceRoot = Get-Location
+}
+
+# Get project name from workspace root
+$projectName = Get-ProjectName $workspaceRoot
+
+# Use conversation_id as session_id (stable across turns), fallback to generation_id
+$sessionId = $conversationId
+if (Test-IsEmpty $sessionId) {
+    $sessionId = $generationId
+}
+
+# Exit gracefully if no session_id available (still allow prompt)
+if (Test-IsEmpty $sessionId) {
+    Write-Output '{"continue": true}'
+    exit 0
+}
+
+# Get worker port from settings with validation
+$workerPort = Get-WorkerPort
+
+# Ensure worker is running (with retries like claude-mem hooks)
+if (-not (Test-WorkerReady -Port $workerPort)) {
+    # Worker not ready - still allow prompt to continue
+    Write-Output '{"continue": true}'
+    exit 0
+}
+
+# Strip leading slash from commands for memory agent (parity with new-hook.ts)
+# /review 101 → review 101 (more semantic for observations)
+$cleanedPrompt = $prompt
+if (-not [string]::IsNullOrEmpty($prompt) -and $prompt.StartsWith("/")) {
+    $cleanedPrompt = $prompt.Substring(1)
+}
+
+# Initialize session via HTTP - handles DB operations and privacy checks
+$payload = @{
+    contentSessionId = $sessionId
+    project = $projectName
+    prompt = $cleanedPrompt
+}
+
+# Send request to worker (fire-and-forget, don't wait for response)
+$uri = "http://127.0.0.1:$workerPort/api/sessions/init"
+Send-HttpPostAsync -Uri $uri -Body $payload
+
+# Always allow prompt to continue
+Write-Output '{"continue": true}'
+exit 0