Fix pool index

[n8mgr]

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[claude]

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[Copilot]

Pull request overview

Fixes an indexing bug in the transaction pool where newly-added v2 transactions were recorded with the wrong index, which could lead to incorrect lookups (and potentially panics/out-of-bounds access) when retrieving v2 pool transactions by ID.

Changes:

• Correct v2 txpool index assignment to use the v2 transaction slice length when inserting new v2 transactions.
• Add a changeset documenting the patch-level fix.

Reviewed changes

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

File	Description
chain/manager.go	Fixes the index stored in txpool.indices when adding v2 pool transactions so it matches the v2txns slice.
.changeset/fix_incorrect_v2_pool_index.md	Documents the fix as a patch change for release notes/changelog generation.

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