Initial commit: llm-router — smart OpenAI/Anthropic/Ollama router

A stdlib pre-router in front of Ollama with LiteLLM backend:
- auto model selection by content/tools/modality, with fallbacks
- OpenAI /v1, Anthropic /v1/messages, and Ollama-native /api/* endpoints
- Whisper-shaped /v1/audio/transcriptions + in-chat audio
- key-based fleet policies (e.g. force a client onto uncensored models)
- optional Bearer auth; launchd/systemd service install
- benchmark harnesses (speed, quality, agentic tool use) with sample results

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

scripts/make-context-variant.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# Create a copy of an Ollama model with a fixed context window (num_ctx).
+# Useful because Ollama's default context is small and large prompts get truncated.
+#
+# Usage:  ./scripts/make-context-variant.sh <base-model> <num_ctx> [new-tag]
+# Example: ./scripts/make-context-variant.sh glm-4.7-flash 131072 glm-4.7-flash:128k
+#
+# Memory note: KV cache grows with num_ctx. On a 36 GB unified-memory Mac, keep
+# the model + KV under ~27 GB (the default GPU wired ceiling) to avoid swapping.
+set -euo pipefail
+BASE="${1:?usage: make-context-variant.sh <base-model> <num_ctx> [new-tag]}"
+NCTX="${2:?need a num_ctx value, e.g. 65536}"
+TAG="${3:-${BASE%%:*}:${NCTX}ctx}"
+
+TMP="$(mktemp -t Modelfile.XXXXXX)"
+printf 'FROM %s\nPARAMETER num_ctx %s\n' "$BASE" "$NCTX" > "$TMP"
+ollama create "$TAG" -f "$TMP"
+rm -f "$TMP"
+echo ">> created $TAG (num_ctx=$NCTX from $BASE)"
+ollama show "$TAG" | grep -i num_ctx || true