fix(sdk-core): encode and decode slug_name as an ABI builtin

[heifner]

wire-sysio#619 made slug_name an ABI builtin, so a deployed contract ABI names the type but has no struct definition for it. The typed action builders (ChainsSlugName, ReservSlugName) were unaffected. Anything encoded or decoded through the generic, ABI-driven serializer failed with Unknown type.

This PR registers slug_name in serializer/Builtins.ts next to string and bool:

• In JS it is the canonical spelling ("ETHEREUM"), matching the chain's JSON carrier and the generated SysioContractTypes.
• On the wire it is the packed uint64.
• It accepts every carrier on the way in: a spelling, a packed number or bigint, a { value } object, or an already-typed value such as ChainsSlugName. The empty spelling encodes as zero.

Tests (tests/serializer/SlugName.test.ts) use an ABI with a slug_name field and no struct: encode, a round trip including slug_name[], carrier equivalence, zero, and rejected spellings. sdk-core: 581/581.

Merge order: merge this before release PR #89. tag-release publishes master at the moment #89 merges, so 1.0.93 must include this fix. wire-tools-ts#108 depends on that release.

[jglanz]

emergency mer because both libraries and tools were broken

[heifner]

E2E is green: run 36177781569. All 15 flows passed (flow-swap-epoch-stress is excluded by default).

Branch combination: wire-sysio master, wire-cdt master, wire-libraries-ts fix/slug-name-serializer-builtin (#90), wire-tools-ts fix/slug-name-string-carrier-actions (#108). Everything else was on its manifest default.

• ✅ batch-operator-slashing (465s)
• ✅ batch-operator-termination (1050s)
• ✅ emissions-soak (2209s)
• ✅ node-owner-nft (552s)
• ✅ operator-collateral-deposit (824s)
• ✅ producer-registration (998s)
• ✅ reserve-lifecycle (943s)
• ✅ swap-from-wire (706s)
• ✅ swap-non-native-tokens (2121s)
• ✅ swap-private-reserves (1968s)
• ✅ swap-to-wire (720s)
• ✅ swap-variance-revert (505s)
• ✅ swap-with-underwriting (1111s)
• ✅ underwriter-slashing (946s)
• ✅ yield-distribution (747s)