add k256 precompile to deploy and chain config for litMainnet

[glitch003]

No description provided.

[Copilot]

Pull request overview

This PR adds the k256 precompile configuration to the litMainnet network in the Hardhat config. The change enables support for Arbitrum Stylus contracts on the litMainnet chain by configuring the required precompile contract addresses.

• Adds stylusContractsForTests configuration block to the litMainnet network
• Configures k256 contract address as 0x029bedeacaf6821ce9a6bd7c8ac73350f24a014f
• Configures p256 contract address with fallback to environment variable

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[Copilot]

The p256 contract address is set to the zero address (0x0000000000000000000000000000000000000000), which will cause failures in both tests and deployment scripts. The test validation checks that both stylusContractsForTests.p256 and stylusContractsForTests.k256 are truthy values, and the deploy script throws an error if either address is missing. A valid p256 contract address should be provided instead of using the zero address as a placeholder.

Suggested change

	p256:
	process.env.LIT_STYLUS_P256_CONTRACT_ADDRESS ||
	'0x0000000000000000000000000000000000000000',
	p256: process.env.LIT_STYLUS_P256_CONTRACT_ADDRESS,

[github-actions]

PASS [ 43.055s] (3/3) lit_node::test toxiproxy::perf_tests::load_with_no_latency
PASS [ 43.259s] (2/3) lit_node::test toxiproxy::perf_tests::load_with_50ms_latency_single_link
PASS [ 89.716s] (1/3) lit_node::test toxiproxy::perf_tests::load_with_50ms_latency_all_links

[DashKash54]

Required when re-deploying Naga-proto