chore(agents): remove rtk integration

RTK compresses only shell output and independent evaluations show little to no end-to-end cost reduction. Drop the package and its install snippets; runtime artifacts were uninstalled separately.

agents/install-cli.md

@@ -20,13 +20,6 @@ Installed via Nix:
 npx ctx7 setup
 ```
 
-rtk init:
-
-```bash
-rtk init -g --codex
-rtk init -g --opencode
-```
-
 ## Update npm-installed agent tools
 
 ```bash

home/base/gui/dev-tools.nix

@@ -19,8 +19,5 @@ in
       agentPackages.pi
       agentPackages.omp
       agentPackages.crush
-
-      # Utilities
-      agentPackages.rtk # CLI proxy that reduces LLM token consumption
     ];
 }

hosts/idols-ruby/packages.nix

@@ -91,8 +91,5 @@ in
       agentPackages.pi
       agentPackages.omp
       agentPackages.crush
-
-      # Utilities
-      agentPackages.rtk # CLI proxy that reduces LLM token consumption
     ];
 }