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builtin:router has been replaced by LLM intent routing in the kernel.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.

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

providers/groq.toml

@@ -137,4 +137,3 @@ supports_tools = true
 supports_vision = true
 supports_streaming = true
 aliases = []
-