docs: restructure around source-of-truth pages

- CONTEXT.md glossary
- README reduced to intro, quickstart and doc index
- new architecture.md, gateway.md (from proxy-key-onboarding.md),
  operations.md; network-access.md rewritten
- coding-cli-setup: stale OMNIROUTE_PORT:-4000 endpoint, terms and
  duplicated per-slot/classifier explanations fixed
- research/README.md index; proxy-request-priority.md moved there as
  superseded

Every doc names keys instead of restating values and links its source.

Refs #55 (#56, #57, #59, #60)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/coding-cli-setup/kimi-cli.md

@@ -2,13 +2,15 @@
 
 [← back to overview](index.md)
 
+> **Source of truth:** [Kimi CLI's repo](https://github.com/MoonshotAI/kimi-cli) for config keys; the [overview](index.md) for the gateway endpoint and context size. If this page disagrees with them, they win.
+
 Kimi CLI speaks plain **OpenAI Chat Completions**. Configure a provider block in its config file (`config.toml`):
 
 ```toml
 [providers.openai]
 type = "openai"
-base_url = "http://<ai-box>:${OMNIROUTE_PORT:-4000}/v1"
-api_key = "<kimi-cli virtual key>"
+base_url = "http://<server>:<OMNIROUTE_API_PORT>/v1"
+api_key = "<kimi-cli API key>"
 ```
 
 If Kimi CLI's response parsing gets confused by Qwen's `<think>...</think>` reasoning tags, check its `reasoning_key` setting — it's configurable for non-standard local server responses.