fix: Makefile auto-detects Termux and sets GOOS=linux

Termux reports GOOS=android but Go has no android/arm64 toolchain.
The Makefile now detects /data/data/com.termux and exports GOOS=linux
so 'make build' works out of the box on Android/Termux.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: amit-vikramaditya

Makefile

@@ -32,6 +32,9 @@ BUILTIN_SKILLS_DIR=$(CURDIR)/skills
 UNAME_S:=$(shell uname -s)
 UNAME_M:=$(shell uname -m)
 
+# Termux detection: Termux reports GOOS=android but is effectively Linux
+IS_TERMUX:=$(shell test -d /data/data/com.termux && echo yes)
+
 # Platform-specific settings
 ifeq ($(UNAME_S),Linux)
 	PLATFORM=linux
@@ -60,6 +63,12 @@ else
 	ARCH=$(UNAME_M)
 endif
 
+# On Termux, force GOOS=linux (Go has no android/arm64 toolchain)
+ifeq ($(IS_TERMUX),yes)
+	export GOOS=linux
+	PLATFORM=linux
+endif
+
 BINARY_PATH=$(BUILD_DIR)/$(BINARY_NAME)-$(PLATFORM)-$(ARCH)
 
 # Default target

README.md

@@ -189,6 +189,8 @@ make build
 
 This compiles V1Claw into a single file. It takes 2-5 minutes on a phone. When it finishes, you'll see a file at `build/v1claw-linux-arm64`.
 
+> 💡 The Makefile auto-detects Termux and handles everything for you. No extra flags needed.
+
 #### Step 6: Run first-time setup
 
 ```bash