Block/template render funcs receive only ctx+content over the ABI, no
services. Load runs on a single pooled instance, so a DB-backed block on
any other pooled instance had a nil pool. HostServices() exposes the
CoreServices bound at _initialize on every instance (live db.* Pool +
capability stubs) so render funcs resolve their pool per-instance. Zero
value in native builds (Serve never called); callers nil-check Pool.
Enables the symposium wasm port (WO-WZ-012).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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