fix(genesis): sync devnet alloc with DevnetAllocData to restore genesis hash

[gzliudan]

Proposed changes

The devnet genesis hash exposed by XDC init devnet diverged from params.DevnetGenesisHash (used by XDC --devnet / DefaultDevnetGenesisBlock). The two paths would have produced different block 0, making nodes initialized via each method unable to peer with one another.

Root cause

Commit 00be1f5 (chore(devnet): may 2026 devnet reset, #2347, 2026-05-25) updated core/genesis_alloc_devnet.go and common/constants.devnet.go as part of a devnet network reset. It added three pre-funded accounts to DevnetAllocData:

4b1a14a10cb48e4cfddd17c379dfcaa358b011bc
d16c20329d391104029d0a850dcdf9ed6e259b60
cc08002e7e4baec892785887a74d35557e8d2c15

params.DevnetGenesisHash was later updated to reflect the new state root in dfce638 (#2329, 2026-05-28).

genesis/devnet.json was NOT touched by either commit; its alloc still contained only the pre-May-2026 eight accounts. Commit 1c0923d (#2354, 2026-07-06) then filled in the config section of devnet.json but again left the alloc unchanged, so the JSON-derived genesis hash remained 0x7dad95... while params.DevnetGenesisHash was 0xb8be00...

Fix

Add the three missing balance-only accounts to genesis/devnet.json alloc, bringing it into parity with DevnetAllocData. After this change:

json.Unmarshal(DevnetGenesis).ToBlock().Hash() == params.DevnetGenesisHash
== 0xb8be003946a9c268...

Verified by running TestEmbeddedGenesisConfigMatchesParams (all three networks pass) and a targeted hash-equality check.

Types of changes

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• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Changes that don't change source code or tests
• docs: Documentation only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that neither fixes a bug nor adds a feature
• revert: Revert something
• style: Changes that do not affect the meaning of the code
• test: Adding missing tests or correcting existing tests

Impacted Components

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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[Copilot]

Pull request overview

This PR fixes a devnet startup incompatibility where XDC init devnet (embedded genesis/devnet.json) produced a different genesis hash than XDC --devnet (params/Go-side genesis), preventing nodes initialized via the two paths from peering.

Changes:

• Add the three missing prefunded accounts to genesis/devnet.json so its alloc matches DevnetAllocData / params.DevnetGenesisHash.
• Add a regression test ensuring embedded genesis JSON for mainnet/testnet/devnet produces the exact canonical genesis hash constants in params.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
genesis/devnet.json	Adds three missing balance-only accounts to devnet alloc to restore genesis hash parity.
core/genesis_load_test.go	Adds a hash-parity regression test between embedded genesis JSON and params.*GenesisHash.