chore: remove router agent (#5)

* chore: remove router agent

builtin:router has been replaced by LLM intent routing in the kernel.
Assistant is now the sole entry point — see librefang/librefang#1336.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* style: format all TOML files with taplo

Fix CI taplo format check by running `taplo fmt` on all 132 TOML files.

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

templates/provider.toml

@@ -11,7 +11,7 @@ key_required = true
 [[models]]
 id = "TODO-model-id"
 display_name = "TODO: Model Display Name"
-tier = "balanced"  # frontier | smart | balanced | fast | local
+tier = "balanced"                         # frontier | smart | balanced | fast | local
 context_window = 128000
 max_output_tokens = 4096
 input_cost_per_m = 0.0