refactor(daemon): remove global ReposRoot, use per-task RepoPath from server

ReposRoot was a daemon-level config that locked all tasks to a single
git repo. Replace with RepoPath in TaskContext so the server can specify
the repo per task. When not provided, daemon falls back to directory mode.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Makefile

@@ -115,7 +115,7 @@ dev:
 	cd server && go run ./cmd/server
 
 daemon:
-	cd server && MULTICA_REPOS_ROOT="${MULTICA_REPOS_ROOT:-$(abspath .)}" go run ./cmd/multica daemon
+	cd server && go run ./cmd/multica daemon
 
 cli:
 	cd server && go run ./cmd/multica $(ARGS)

server/cmd/multica/cmd_daemon.go

@@ -22,7 +22,6 @@ var daemonCmd = &cobra.Command{
 
 func init() {
 	f := daemonCmd.Flags()
-	f.String("repos-root", "", "Base directory for task repositories (env: MULTICA_REPOS_ROOT)")
 	f.String("config-path", "", "Path to daemon config file (env: MULTICA_DAEMON_CONFIG)")
 	f.String("daemon-id", "", "Unique daemon identifier (env: MULTICA_DAEMON_ID)")
 	f.String("device-name", "", "Human-readable device name (env: MULTICA_DAEMON_DEVICE_NAME)")
@@ -36,7 +35,6 @@ func runDaemon(cmd *cobra.Command, _ []string) error {
 	overrides := daemon.Overrides{
 		ServerURL:   cli.FlagOrEnv(cmd, "server-url", "MULTICA_SERVER_URL", ""),
 		WorkspaceID: cli.FlagOrEnv(cmd, "workspace-id", "MULTICA_WORKSPACE_ID", ""),
-		ReposRoot:   flagString(cmd, "repos-root"),
 		ConfigPath:  flagString(cmd, "config-path"),
 		DaemonID:    flagString(cmd, "daemon-id"),
 		DeviceName:  flagString(cmd, "device-name"),

server/internal/daemon/config.go

@@ -30,7 +30,6 @@ type Config struct {
 	DeviceName        string
 	RuntimeName       string
 	Agents            map[string]AgentEntry // "claude" -> entry, "codex" -> entry
-	ReposRoot         string                // parent directory containing all repos
 	WorkspacesRoot    string                // base path for execution envs (default: ~/multica_workspaces)
 	KeepEnvAfterTask  bool                  // preserve env after task for debugging
 	PollInterval      time.Duration
@@ -43,7 +42,6 @@ type Config struct {
 type Overrides struct {
 	ServerURL         string
 	WorkspaceID       string
-	ReposRoot         string
 	WorkspacesRoot    string
 	ConfigPath        string
 	PollInterval      time.Duration
@@ -118,22 +116,6 @@ func LoadConfig(overrides Overrides) (Config, error) {
 		host = "local-machine"
 	}
 
-	// Repos root: override > env > cwd
-	reposRoot := strings.TrimSpace(os.Getenv("MULTICA_REPOS_ROOT"))
-	if overrides.ReposRoot != "" {
-		reposRoot = overrides.ReposRoot
-	}
-	if reposRoot == "" {
-		reposRoot, err = os.Getwd()
-		if err != nil {
-			return Config{}, fmt.Errorf("resolve working directory: %w", err)
-		}
-	}
-	reposRoot, err = filepath.Abs(reposRoot)
-	if err != nil {
-		return Config{}, fmt.Errorf("resolve absolute repos root: %w", err)
-	}
-
 	// Durations: override > env > default
 	pollInterval, err := durationFromEnv("MULTICA_DAEMON_POLL_INTERVAL", DefaultPollInterval)
 	if err != nil {
@@ -181,12 +163,11 @@ func LoadConfig(overrides Overrides) (Config, error) {
 		workspacesRoot = overrides.WorkspacesRoot
 	}
 	if workspacesRoot == "" {
-		home, _ := os.UserHomeDir()
-		if home != "" {
-			workspacesRoot = filepath.Join(home, "multica_workspaces")
-		} else {
-			workspacesRoot = filepath.Join(reposRoot, "multica_workspaces")
+		home, err := os.UserHomeDir()
+		if err != nil {
+			return Config{}, fmt.Errorf("resolve home directory: %w (set MULTICA_WORKSPACES_ROOT to override)", err)
 		}
+		workspacesRoot = filepath.Join(home, "multica_workspaces")
 	}
 	workspacesRoot, err = filepath.Abs(workspacesRoot)
 	if err != nil {
@@ -204,7 +185,6 @@ func LoadConfig(overrides Overrides) (Config, error) {
 		DeviceName:        deviceName,
 		RuntimeName:       runtimeName,
 		Agents:            agents,
-		ReposRoot:         reposRoot,
 		WorkspacesRoot:    workspacesRoot,
 		KeepEnvAfterTask:  keepEnv,
 		PollInterval:      pollInterval,

server/internal/daemon/daemon.go

@@ -33,7 +33,7 @@ func (d *Daemon) Run(ctx context.Context) error {
 	for name := range d.cfg.Agents {
 		agentNames = append(agentNames, name)
 	}
-	d.logger.Info("starting daemon", "agents", agentNames, "workspace_id", d.cfg.WorkspaceID, "server", d.cfg.ServerBaseURL, "repos_root", d.cfg.ReposRoot)
+	d.logger.Info("starting daemon", "agents", agentNames, "workspace_id", d.cfg.WorkspaceID, "server", d.cfg.ServerBaseURL)
 
 	if strings.TrimSpace(d.cfg.WorkspaceID) == "" {
 		workspaceID, err := d.ensurePaired(ctx)
@@ -279,7 +279,7 @@ func (d *Daemon) runTask(ctx context.Context, task Task) (TaskResult, error) {
 	}
 	env, err := execenv.Prepare(execenv.PrepareParams{
 		WorkspacesRoot: d.cfg.WorkspacesRoot,
-		ReposRoot:      d.cfg.ReposRoot,
+		RepoPath:       task.Context.RepoPath,
 		TaskID:         task.ID,
 		AgentName:      task.Context.Agent.Name,
 		Task:           taskCtx,

server/internal/daemon/execenv/execenv.go

@@ -21,7 +21,7 @@ const (
 // PrepareParams holds all inputs needed to set up an execution environment.
 type PrepareParams struct {
 	WorkspacesRoot string           // base path for all envs (e.g., ~/multica_workspaces)
-	ReposRoot      string           // source git repo (for worktree creation)
+	RepoPath       string           // source git repo path (for worktree creation), provided per-task by server
 	TaskID         string           // task UUID — used for directory name
 	AgentName      string           // for git branch naming only
 	Task           TaskContextForEnv // context data for writing files
@@ -100,8 +100,8 @@ func Prepare(params PrepareParams, logger *slog.Logger) (*Environment, error) {
 	}
 
 	// Detect git repo and set up worktree if available.
-	if params.ReposRoot != "" {
-		if gitRoot, ok := detectGitRepo(params.ReposRoot); ok {
+	if params.RepoPath != "" {
+		if gitRoot, ok := detectGitRepo(params.RepoPath); ok {
 			branchName := fmt.Sprintf("agent/%s/%s", sanitizeName(params.AgentName), shortID(params.TaskID))
 
 			// Get the default branch as base ref.

server/internal/daemon/execenv/execenv_test.go

@@ -96,7 +96,7 @@ func TestPrepareDirectoryMode(t *testing.T) {
 
 	env, err := Prepare(PrepareParams{
 		WorkspacesRoot: workspacesRoot,
-		ReposRoot:      reposRoot,
+		RepoPath:      reposRoot,
 		TaskID:         "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
 		AgentName:      "Test Agent",
 		Task: TaskContextForEnv{
@@ -176,7 +176,7 @@ func TestPrepareGitWorktreeMode(t *testing.T) {
 
 	env, err := Prepare(PrepareParams{
 		WorkspacesRoot: workspacesRoot,
-		ReposRoot:      reposRoot,
+		RepoPath:      reposRoot,
 		TaskID:         "b2c3d4e5-f6a7-8901-bcde-f12345678901",
 		AgentName:      "Code Reviewer",
 		Task: TaskContextForEnv{
@@ -334,7 +334,7 @@ func TestCleanupGitWorktree(t *testing.T) {
 
 	env, err := Prepare(PrepareParams{
 		WorkspacesRoot: workspacesRoot,
-		ReposRoot:      reposRoot,
+		RepoPath:      reposRoot,
 		TaskID:         "c3d4e5f6-a7b8-9012-cdef-123456789012",
 		AgentName:      "Cleanup Test",
 		Task:           TaskContextForEnv{IssueTitle: "Cleanup test"},
@@ -477,7 +477,7 @@ func TestCleanupPreservesLogs(t *testing.T) {
 
 	env, err := Prepare(PrepareParams{
 		WorkspacesRoot: workspacesRoot,
-		ReposRoot:      t.TempDir(), // not a git repo
+		RepoPath:      t.TempDir(), // not a git repo
 		TaskID:         "d4e5f6a7-b8c9-0123-defa-234567890123",
 		AgentName:      "Preserve Test",
 		Task:           TaskContextForEnv{IssueTitle: "Preserve test"},

server/internal/daemon/types.go

@@ -49,6 +49,7 @@ type TaskContext struct {
 	Agent            AgentContext   `json:"agent"`
 	Runtime          RuntimeContext `json:"runtime"`
 	WorkspaceContext string         `json:"workspace_context,omitempty"`
+	RepoPath         string         `json:"repo_path,omitempty"`
 }
 
 // IssueContext holds issue details for task execution.