chore: remove obsolete hosts and update dependencies

[connerohnesorge]

Summary by CodeRabbit

• Chores
  • Added RTK package to macOS development environment configuration
  • Updated shell initialization to export new authentication token and improved PATH management to prioritize local development tools
  • Removed deprecated host-specific configuration files
  • Upgraded Go development toolchain from version 1.25 to 1.26 in project templates

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6266bd27-14c8-4c3d-8a2e-a255a8e429da

📥 Commits

Reviewing files that changed from the base of the PR and between 4cb56e4 and d970170.

⛔ Files ignored due to path filters (2)

• .config/home-manager/flake.lock is excluded by !**/*.lock
• templates/go-shell/flake.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• .config/home-manager/home-darwin.nix
• .zshrc
• hosts/CB14957.local/default.nix
• hosts/CB14957/default.nix
• templates/go-shell/flake.nix

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Walkthrough

This PR updates dotfiles configuration by activating RTK package support in Darwin home-manager, modifying shell startup to export a new authentication token and restructure PATH, removing two host configuration files, and upgrading the Go development template from version 1.25 to 1.26.

Changes

Configuration and Development Template Updates

Layer / File(s)	Summary
Home Manager and shell environment setup .config/home-manager/home-darwin.nix, .zshrc	Uncomments and activates the llm-agents RTK package in home-manager. Adds NERVOUS_MCP_TOKEN export populated by cnb auth token, comments out GITLAB_URI, and refactors PATH setup to use a path=() array that prepends ~/.cargo/bin and $BUN_INSTALL/bin before the existing path.
Go development template version upgrade templates/go-shell/flake.nix	Updates the Go development flake from version 1.25 to 1.26 by switching the buildGoModule overlay from buildGo125Module to buildGo126Module and replacing the go_1_25 package with go_1_26 in the dev shell.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• connerohnesorge/dotfiles#208: Prior work that added the multi-user host configurations which this PR removes, along with related home-manager configuration updates.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cleanup-and-update-deps

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