fix: convert agent-network.ts and self-improvement.ts to zod/v4

Both files carry @ts-nocheck, so there's no type-inference benefit
here (that was vector.ts's problem, fixed separately). This is purely
about making the runtime JSON Schema serializer uniform across all 23
tools: the MCP SDK routes Zod v3 schemas through the vendored
zod-to-json-schema and Zod v4 schemas through Zod's own native
toJSONSchema, and the two disagree on `additionalProperties` for
object schemas. Converting vector.ts alone left the surface split 11
"open" (v4, additionalProperties absent) / 12 "closed" (v3,
additionalProperties: false).

Plain import swaps — neither file uses z.record, so no signature
changes were needed. Both files use z.<type>().default(...) on several
fields (agent-network.ts: limit; self-improvement.ts:
proposalOutputIndex, priority, focus); verified via the SDK's own
zod-compat safeParseAsync/objectFromShape helpers that omitting each
of those fields still resolves to its default under zod/v4, exactly as
under v3. Also verified live: a missing required argument is still
rejected (schema-validation error, not a handler crash) on one tool
from each of the three files.

Confirmed post-conversion: all 23 tools report additionalProperties
consistently (0 false / 23 absent — uniform), typecheck stays clean
(these files are excluded from it), and build + unit tests pass.

src/vector/agent-network.ts

@@ -1,7 +1,7 @@
 // @ts-nocheck
 // Agent network tools: register, discover, message, get_profile, update, deregister, transfer
 
-import { z } from "zod";
+import { z } from "zod/v4";
 import { Lucid, fromText, toText, Data, Constr, validatorToAddress, validatorToScriptHash, getAddressDetails, credentialToAddress } from '@lucid-evolution/lucid';
 import { blake2b } from '@noble/hashes/blake2b';
 import { OgmiosProvider } from './ogmios-provider.js';

src/vector/self-improvement.ts

@@ -2,7 +2,7 @@
 // Self-Improvement Module tools: submit proposal, critique, endorse, browse, analyze metrics
 // Game 6 of the Vector game theory ecosystem
 
-import { z } from "zod";
+import { z } from "zod/v4";
 import { Lucid, fromText, toText, Data, Constr, credentialToAddress, getAddressDetails, SLOT_CONFIG_NETWORK } from '@lucid-evolution/lucid';
 
 // Vector slot config - resolved from chain via Ogmios queryNetwork/startTime