v1.1.1 — fix chunked materialize (cordis Proxy signature check)

Fix

chunked materialize was silently never installed since v1.0.0: ctx.get('sessionPersistence') returns a cordis Proxy, and String(proxy.encodeMaterialization) is [native code] (bound shadow method), so the source-signature check always failed. The fork-seed full-serialization OOM fix never actually ran in production — the cause of the reported model-select / message-send lag.

Now the check reads the prototype method (real source), with own-property fallback for mocks.

Verified

• Log confirms chunked materialize installed (chunk=50000 events/frame)
• 51 tests ALL PASS
• dsh stable (web 2.9s startup, mem 1.32GB idle)