Proposal: add a catch-all hook for dynamic RPC paths

.changeset/fallback-call.md

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+---
+"capnweb": minor
+---
+
+Add an opt-in `fallbackCall` for `RpcTarget`s. If a path followed over RPC reaches an `RpcTarget` that doesn't declare the requested property as a method or getter, and that name is not an instance property or local stub helper, a target method under the exported `fallbackCall` symbol receives the unmatched remainder of the path and the call's arguments. The handler may be async, and promise pipelining is preserved: the whole dotted path is sent in one call with the same round-trip cost as a declared method. Canonical numeric property indexes such as `stub.items[0]` arrive as numeric path segments; RPC/Promise helper names such as `then`, `map`, and `dup` remain local stub APIs.

examples/README.md

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 Examples
 
 - batch-pipelining: Node server + client. Shows batching and pipelining to execute a dependent sequence of RPC calls in a single HTTP round trip, with timing vs sequential.
+- dynamic-capabilities: Cloudflare Worker + Durable Object. Shows PR #2's runtime capability registry: one client publishes a capability, another calls it through `fallbackCall`.
 - worker-react: Cloudflare Worker backend + React frontend. Shows the same pattern from a browser app, served by the Worker.
 
 Notes
 
-- Examples import from `../../dist/index.js`. Run `npm run build` at the repo root before running an example.
+- Most examples import from `../../dist/index.js`; run `npm run build` at the repo root first.
+  `dynamic-capabilities` is a standalone Workers package that depends on the repo via `file:../..`.
 - Requires Node 18+ (built-in `fetch`, `Request`, `Response`).