Remove macOS stats gathering support, require Linux with /procv0.8.4

Remove non-functional macOS monitoring code that used native tools (sysctl, vm_stat, netstat, iostat). Now loadbars exits with an error when attempting local stats gathering on non-Linux systems. macOS can still be used as a client to monitor remote Linux servers via SSH.

1 files changed, 6 insertions, 12 deletions

diff --git a/AGENTS.md b/AGENTS.md
index 63531fd..ab005e5 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -66,33 +66,27 @@ Network interface: chosen by `netint` config or first non-`lo`; press `n` to cyc
 
 - `go test ./...` or `mage test`. No UI tests; collector has parse tests for protocol (e.g. `ParseNetLine` for Linux-style `/proc/net/dev` output).
 
-## macOS support
+## macOS support (client only)
 
-Loadbars supports macOS with automatic window activation and OS-specific monitoring scripts.
+Loadbars supports macOS as a client to monitor remote Linux servers via SSH.
 
 ### Implementation details
 
-- **Script embedding:** Both Linux and Darwin monitoring scripts are embedded in the binary
-- **OS detection:** Automatically uses the correct script based on the host:
-  - `localhost` on macOS → Darwin script (sysctl, vm_stat, netstat, iostat)
-  - `localhost` on Linux → Linux script (/proc filesystem)
-  - All remote hosts → Linux script (assumes remote servers are Linux)
 - **Window activation:** macOS-specific code automatically brings SDL window to foreground
   - Uses build tags (`activate_darwin.go` and `activate.go`)
   - No external helper script needed
 
 ### Key files
 
-- `internal/collector/script.go` - Embeds both scripts
-- `internal/collector/collector.go` - Selects script based on host (checks if `/proc` exists for localhost)
+- `internal/collector/script.go` - Embeds the Linux monitoring script
+- `internal/collector/collector.go` - Runs Linux script locally or over SSH; exits with error if local system lacks /proc
 - `internal/display/activate_darwin.go` - macOS-specific activation using `open -a`
 - `internal/display/activate.go` - No-op for other platforms
 
 ### Known limitations
 
-- Remote macOS hosts are not supported (assumes all remote hosts are Linux)
-- macOS script doesn't provide per-core CPU statistics (iostat limitation)
-- Swap usage on macOS always shows 0 (macOS uses compressed memory differently)
+- Local monitoring on macOS is not supported (requires Linux with /proc filesystem)
+- All remote hosts must be Linux (assumes all remote hosts are Linux)
 
 ## Useful references