Ship as tm with install to GOPATH/bin and sandbox env overrides.

Co-authored-by: Cursor <cursoragent@cursor.com>

Makefile

@@ -1,10 +1,16 @@
-BINARY      := task-master
+BINARY      := tm
 CMD         := ./cmd/task-master
 VERSION_PKG := task/internal/version
 GIT_HASH    := $(shell git rev-parse --short HEAD 2>/dev/null || echo unknown)
 LDFLAGS     := -X $(VERSION_PKG).BuildVersion=$(GIT_HASH)
 
-.PHONY: build run version demo
+# Default: Go workspace bin (e.g. ~/go/bin). Override with: make install PREFIX=...
+GOPATH      ?= $(shell go env GOPATH)
+PREFIX      ?= $(GOPATH)
+INSTALL_BIN := $(PREFIX)/bin
+DEV_HOME    := $(CURDIR)/.dev-home
+
+.PHONY: build run run-dev install uninstall test version demo
 
 build:
 	go build -ldflags "$(LDFLAGS)" -o bin/$(BINARY) $(CMD)
@@ -12,6 +18,22 @@ build:
 run: build
 	./bin/$(BINARY)
 
+# Sandbox: isolated config/data under ./.dev-home (does not touch ~/.config)
+run-dev: build
+	TASK_MASTER_HOME=$(DEV_HOME) ./bin/$(BINARY)
+
+install: build
+	install -d $(INSTALL_BIN)
+	install -m 755 bin/$(BINARY) $(INSTALL_BIN)/$(BINARY)
+	@echo "installed $(INSTALL_BIN)/$(BINARY)"
+
+uninstall:
+	rm -f $(INSTALL_BIN)/$(BINARY)
+	@echo "removed $(INSTALL_BIN)/$(BINARY)"
+
+test:
+	go test ./...
+
 version: build
 	./bin/$(BINARY) version