[anurag629]

The last of F7's docs gaps from #440: the low-level APIs.

• server/fetch-runtimes.mdx, new section "Node's http module, Fastify, Koa": turns Node's req into a Request and streams the Response back to chatcopsVercelHandler, with the session path routed and the client IP taken from the socket. I ran the same code against a scripted provider before writing it up. /session returned a token, the reply streamed, and a request without a token got 401 session_required.
• packages/server/README.md, "Custom integrations": it showed handleChat, which streams the 0.5 format and sends no session token, so with feat(server)!: require session tokens by default, with allowAnonymous to opt out #462's default it gets session_required on every request. It now points to the Fetch handler and the bridge. It also says why bridging beats calling createChatHandler directly: the handler already does CORS, origins, body limits, pings, sessions and the 0.5 format.
• core/providers.mdx: a table of every runTurn option and what the turn returns.
• core/testing.mdx: the CLI's API is the command, its flags and defineConfig. Its other exports can change in a minor release until cli 1.0.

Tested: docs:check (147 blocks) and lint pass. The docs bot index gets rebuilt with the 1.0-rc release, since several docs PRs will land before then.