fix(vibenet): remove 200ms Blocks feature card — not live on vibenet yet

The "200ms Blocks" card was added to the Vibenet landing page in #48 as a
preview of the Denim upgrade, but the underlying protocol change has not
shipped to vibenet. Verified against https://rpc.vibes.base.org today:

  - consecutive blocks are 2s apart, not 200ms;
  - `eth_getBlockByNumber` returns no `timestampMs` field;
  - the BaseTime predeploy at 0x42..0030 is an uninitialized proxy
    (`eth_call timestampMs()` reverts with "implementation not initialized").

So all three capability highlights on the card are currently false, and its
"Explore Blocks" CTA sends people to an explorer with no millisecond support.

Also drops the unconditional BaseTime row that the same PR injected into the
vibenet contracts list, for the same reason — it advertises a predeploy that
is not initialized on this network.

The Denim changelog entry (/upgrades/changelog/200ms-blocks) is unchanged:
that page is the roadmap surface and is correctly marked as upcoming. Add the
feature card back in the same PR that turns 200ms blocks on for vibenet.

Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

Author: montycheese

app/vibenet/data/contracts.ts

@@ -8,24 +8,21 @@ import type { ContractMeta, ResolvedContract } from '../library/types';
 //   - `hidden` keeps internal/demo deployments out of the public list;
 //   - `watch` adds an "add to wallet" affordance for tokens.
 export const CONTRACT_REGISTRY: Record<string, ContractMeta> = {
-  baseTime: { label: 'BaseTime (predeploy)' },
   usdv: { label: 'USDV (ERC-20)', watch: { type: 'ERC20', symbol: 'USDV', decimals: 6 } },
   nfv: { label: 'NFV (ERC-721)' },
   // Internal/demo deployments intentionally omitted from the public list.
   faucetAddress: { label: 'Faucet', hidden: true },
   vibecheck: { label: 'Vibecheck', hidden: true },
 };
 
-const BASE_TIME_ADDRESS = '0x4200000000000000000000000000000000000030';
-
 // Turn the raw contracts map into a display list: keep only real addresses,
 // drop hidden entries, and layer on registry metadata (or a humanized label).
 // Returns null while the contracts payload hasn't loaded yet.
 export function resolveContracts(
   contracts: Record<string, unknown> | null,
 ): ResolvedContract[] | null {
   if (!contracts) return null;
-  return Object.entries({ ...contracts, baseTime: BASE_TIME_ADDRESS })
+  return Object.entries(contracts)
     .filter((entry): entry is [string, string] => isAddress(entry[1]))
     .filter(([key]) => !CONTRACT_REGISTRY[key]?.hidden)
     .map(([key, address]) => {

app/vibenet/data/features.ts

@@ -35,45 +35,11 @@ export const FEATURES: VibenetFeature[] = [
     secondaryCta: { label: 'Build Your Own', href: 'https://docs.base.org/base-chain/specs/upgrades/cobalt/eip-8130', external: true },
     links: [{ label: 'EIP-8130', href: 'https://eip.tools/eip/8130', external: true }],
   },
-  {
-    id: '200ms-canonical-blocks',
-    tag: '200ms',
-    title: '200ms Blocks',
-    summary:
-      'Native blocks at a 200ms cadence, each with its own hash, state, receipts, and finality lifecycle.',
-    status: 'preview',
-    availability: 'Coming soon in ',
-    availabilityLabel: 'Base Denim',
-    highlights: [
-      {
-        title: 'Native Blocks Every 200ms',
-        detail: 'Full blocks, not partial pending-state updates or Flashblocks.',
-      },
-      {
-        title: 'Millisecond RPC Timestamps',
-        detail: 'Read exact block time from timestampMs and blockTimestampMs fields.',
-      },
-      {
-        title: 'Onchain Millisecond Time',
-        detail: 'Contracts can read the current full timestamp from the BaseTime predeploy.',
-      },
-      {
-        title: 'Ethereum Compatible',
-        detail: 'Header timestamps and EVM block.timestamp remain in whole seconds.',
-      },
-    ],
-    cta: {
-      label: 'Explore Blocks',
-      href: '/vibenet/explorer',
-    },
-    links: [
-      {
-        label: 'Protocol source',
-        href: 'https://github.com/base/contracts/blob/4848ec70d8f1062fec59470d6e731e13ece8a728/src/L2/BaseTime.sol',
-        external: true,
-      },
-    ],
-  },
+  // 200ms Blocks is intentionally absent: it is a Denim roadmap item that has
+  // not landed on vibenet yet (blocks are still ~2s, `timestampMs` is not on
+  // the RPC payload, and the BaseTime predeploy is an uninitialized proxy).
+  // It stays documented under /upgrades/changelog/200ms-blocks until it ships
+  // here — add the feature card back in the same PR that enables it.
 ];
 
 // Raw feature shape as it appears in the API `config` payload.