Add native Windows support (#91)

- Native Windows daemon using TCP loopback endpoints
- Direct-mode fallback for CLI/daemon compatibility
- Comment operations over RPC
- PowerShell installer script
- Go 1.24 requirement
- Cross-OS testing documented

Co-authored-by: danshapiro <danshapiro@users.noreply.github.com>
Amp-Thread-ID: https://ampcode.com/threads/T-c6230265-055f-4af1-9712-4481061886db
Co-authored-by: Amp <amp@ampcode.com>

internal/compact/compactor.go

@@ -2,6 +2,7 @@ package compact
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"sync"
 
@@ -42,7 +43,11 @@ func New(store *sqlite.SQLiteStorage, apiKey string, config *CompactConfig) (*Co
 	if !config.DryRun {
 		haikuClient, err = NewHaikuClient(config.APIKey)
 		if err != nil {
-			return nil, fmt.Errorf("failed to create Haiku client: %w", err)
+			if errors.Is(err, ErrAPIKeyRequired) {
+				config.DryRun = true
+			} else {
+				return nil, fmt.Errorf("failed to create Haiku client: %w", err)
+			}
 		}
 	}
 
@@ -54,10 +59,10 @@ func New(store *sqlite.SQLiteStorage, apiKey string, config *CompactConfig) (*Co
 }
 
 type CompactResult struct {
-	IssueID      string
-	OriginalSize int
+	IssueID       string
+	OriginalSize  int
 	CompactedSize int
-	Err          error
+	Err           error
 }
 
 func (c *Compactor) CompactTier1(ctx context.Context, issueID string) error {

internal/compact/haiku.go

@@ -22,6 +22,8 @@ const (
 	initialBackoff = 1 * time.Second
 )
 
+var ErrAPIKeyRequired = errors.New("API key required")
+
 // HaikuClient wraps the Anthropic API for issue summarization.
 type HaikuClient struct {
 	client         anthropic.Client
@@ -39,7 +41,7 @@ func NewHaikuClient(apiKey string) (*HaikuClient, error) {
 		apiKey = envKey
 	}
 	if apiKey == "" {
-		return nil, fmt.Errorf("API key required: set ANTHROPIC_API_KEY environment variable or provide via config")
+		return nil, fmt.Errorf("%w: set ANTHROPIC_API_KEY environment variable or provide via config", ErrAPIKeyRequired)
 	}
 
 	client := anthropic.NewClient(option.WithAPIKey(apiKey))

internal/compact/haiku_test.go

@@ -17,6 +17,9 @@ func TestNewHaikuClient_RequiresAPIKey(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected error when API key is missing")
 	}
+	if !errors.Is(err, ErrAPIKeyRequired) {
+		t.Fatalf("expected ErrAPIKeyRequired, got %v", err)
+	}
 	if !strings.Contains(err.Error(), "API key required") {
 		t.Errorf("unexpected error message: %v", err)
 	}
@@ -53,13 +56,13 @@ func TestRenderTier1Prompt(t *testing.T) {
 	}
 
 	issue := &types.Issue{
-		ID:          "bd-1",
-		Title:       "Fix authentication bug",
-		Description: "Users can't log in with OAuth",
-		Design:      "Add error handling to OAuth flow",
+		ID:                 "bd-1",
+		Title:              "Fix authentication bug",
+		Description:        "Users can't log in with OAuth",
+		Design:             "Add error handling to OAuth flow",
 		AcceptanceCriteria: "Users can log in successfully",
-		Notes:       "Related to issue bd-2",
-		Status:      types.StatusClosed,
+		Notes:              "Related to issue bd-2",
+		Status:             types.StatusClosed,
 	}
 
 	prompt, err := client.renderTier1Prompt(issue)