feat(home): work k8s/TF CLIs, shell + git polish, themed btop, lazygit

- work.nix: k9s, kubectx/kubens, stern, dyff, tflint, terraform-docs,
  yq-go for the EDaaS Kubernetes/Terraform workflow.
- shell.nix: btop themed Catppuccin Mocha (vendored theme; not bundled),
  hyperfine + sd, and the tmux extrakto plugin (prefix+Tab grab).
- git.nix: amend/fixup/undo aliases, commit-graph maintenance, and
  lazygit (themed). Corrected the stale work/default.nix doc references.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lyrathorpe/home/work.nix

@@ -39,6 +39,14 @@
     pkgs.wget
     pkgs.claude-code
     pkgs.google-cloud-sdk
+    # Day-to-day Kubernetes / Helm / Terraform accelerators for this box.
+    pkgs.k9s # cluster TUI
+    pkgs.kubectx # kubectx + kubens (context/namespace switch)
+    pkgs.stern # multi-pod log tail
+    pkgs.dyff # semantic YAML/manifest diffs (Helm release drift)
+    pkgs.tflint # Terraform linter (catches what terraformls won't)
+    pkgs.terraform-docs # generate Terraform module docs
+    pkgs.yq-go # jq for YAML
   ];
   services.ssh-agent.enable = true;
   home.shellAliases = {