Agent-facing service schemas (external on any schema, toTypeScript audience, AsyncDataService.toObserveState) + defaultFactory Store<any> fix

[krisnye]

Summary

Agent-facing service schemas

• Schema-level external (Schema.external) — the { agent?, link? } exposure policy now lives on the member schema itself and is valid on any schema (actions, states, nested groups). BREAKING: signature.external is removed — move it up one level onto the function schema.
• toTypeScript(schema, name, { audience }) — audience defaults to "agent", omitting every property (at any depth) whose policy hides it from that channel, so external: { agent: false } members are never documented to an agent. "link" keeps only link: true members; "all" emits everything.
• AsyncDataService.toObserveState(service) — walks the service's schema (through nested groups), observes every observe member in parallel via Observe.fromProperties, and emits one object with the service's nested shape (state.foo.state.b). Typed as AsyncDataService.State<T>: Observe<X> → X, actions and action-only groups omitted, optional members stay optional. Re-derives the member set when service.schema changes. Does not filter by external.

defaultFactory type collapse fix

A defaultFactory store was not assignable to Store<any, any, any>: relating Archetype.insert's generic <T>(row: Exact<V, T>) signature to an any-row archetype infers T = any, and Exact<V, any> collapsed to never. So a single Store<any, any, any>-typed transaction member (e.g. the library's own applyOperations) was rejected, erasing every transaction on its plugin, and Store.Resources / Store.Archetypes of such a store silently evaluated to never. Exact now passes any through (excess-property rejection on real inserts is unchanged).

Verified against the standalone 30-probe consumer repro: on 0.10.13 the bomb configs give 8 errors and 6/30 probes fail; against this branch the bomb gives 0 errors and 29/30 pass. The remaining line (p29 §5, mutable Store → ReadonlyStore<any, any, any>) also fails for a plain store and predates defaultFactory — out of scope here.

Version bump to 0.10.26.

Test plan

• resolve-external-invocation.test.ts — schema-level policy on function and non-function members
• to-typescript.test.ts — agent (default) / link / all audiences, nested hiding, hoisting reacts to hidden members
• to-observe-state.test.ts — nested reconstruction, dotted keys, waits for all values, re-emit on change, unobserve, missing optional members, schema change releases old subscriptions; State<T> type assertion
• default-factory.test.ts — compile-time regressions (fail without the fix): applyOperations + DFK plugin keeps transactions, DFK store → Store<any, any, any>, Store.Archetypes/Resources not never
• Clean monorepo pnpm -r run typecheck, pnpm -r run test, pnpm run lint

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