feat: define module HTTP routes

Phase 5B, pass 1: framework-neutral module HTTP route contracts and runtime
registration. Adds @ekklesia/contracts' module-http.ts (methods, canonical
path grammar, route definition/context/handler types, and validation)
and Core's module runtime staging/publication of a module's declared
routes alongside its capabilities, gated on the module's own manifest
permissions. Routes are collected into StartedModuleRuntime as an
immutable snapshot but are not yet mounted into apps/api; that is pass 2.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

packages/contracts/src/index.ts

@@ -1,6 +1,7 @@
 export * from "./authorization.js";
 export * from "./identifiers.js";
 export * from "./identity.js";
+export * from "./module-http.js";
 export * from "./module-lifecycle.js";
 export * from "./module-manifest.js";
 export * from "./module-migration.js";