Add offline-first task-master TUI with tickets, board lists, and undo.

Charm-based CLI with JSON persistence, status/list filters, external editor editing, command-history undo/redo, and glamour markdown without AutoStyle OSC hangs.

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

Makefile

@@ -0,0 +1,16 @@
+BINARY      := task-master
+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
+
+build:
+	go build -ldflags "$(LDFLAGS)" -o bin/$(BINARY) $(CMD)
+
+run: build
+	./bin/$(BINARY)
+
+version: build
+	./bin/$(BINARY) version