Fix/improve signing schemes hashing

[Ansonhkg]

WHAT

• Extended the signing stack so Cosmos ECDSA hashes are handled automatically and the raw pkpSign API exposes the existing bypassAutoHashing escape hatch.
• Documented the hashing defaults/bypass option.
• Added an e2e ticket suite that exercises every supported scheme/curve pair to protect against regressions.

[Copilot]

Pull Request Overview

This PR adds ECDSA signing support for Cosmos chain, introduces a bypassAutoHashing option to skip automatic payload hashing, and includes comprehensive end-to-end tests with documentation for all supported signing schemes.

• Adds ECDSA hash function mappings for Cosmos (SHA-256/SHA-384)
• Introduces bypassAutoHashing parameter to allow pre-hashed payloads (useful for EIP-712)
• Adds comprehensive e2e test suite covering 14 signing schemes across multiple chains
• Updates documentation with signing scheme tables and bypass hashing guidance

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/networks/src/networks/vNaga/shared/schemas/LitMessageSchema.ts	Adds cosmos chain support with ECDSA hash mappers and improves error handling with explicit validation checks
packages/networks/src/networks/vNaga/shared/managers/api-manager/pkpSign/pkpSign.InputSchema.ts	Adds optional bypassAutoHashing boolean parameter to PKPSignInputSchema
packages/e2e/src/tickets/signing-schemes.suite.ts	New comprehensive test suite covering 14 signing schemes (ECDSA, Schnorr, EdDSA variants) across ethereum, bitcoin, cosmos, and solana chains
packages/e2e/src/tickets/signing-schemes.spec.ts	Test entry point that registers the new signing schemes test suite
docs/sdk/auth-context-consumption/pkp-sign.mdx	Adds documentation for bypassAutoHashing option with EIP-712 example and maintains scheme reference table
docs/node-ops/staking-and-delegation.mdx	Adds consensus threshold rule section and removes trailing whitespace
docs/learning-lit/how-it-works.mdx	Adds comprehensive table of all 14 supported signing schemes with their curves
.changeset/gold-ducks-repeat.md	Documents the patch changes for networks and e2e packages

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[Copilot]

The threshold formula notation could be clearer with explicit parentheses to avoid ambiguity. Consider updating to:

All Lit validator and signing operations are guarded by a threshold rule that requires at least `ROUNDUP(MAX(3, (2N/3)))` participating nodes for a committee of size `N`.

This makes it explicit that the division 2N/3 is computed first, then compared with 3, and finally rounded up.

Suggested change

	All Lit validator and signing operations are guarded by a threshold rule that requires at least `ROUNDUP(MAX(3, 2N/3))` participating nodes for a committee of size `N`.
	All Lit validator and signing operations are guarded by a threshold rule that requires at least `ROUNDUP(MAX(3, (2N/3)))` participating nodes for a committee of size `N`.