Add additional context when siacoin input validation fails

[ChrisSchinnerl]

No description provided.

[n8mgr]

string error messages strike again

[Copilot]

Pull request overview

This PR improves debugging of v2 siacoin input spend-policy validation failures by adding more detail to the returned error messages, and documents the change via a knope changeset.

Changes:

• Add satisfied/required counts to the PolicyTypeThreshold “threshold not reached” verification error.
• Expand the v2 siacoin spend-policy validation error to include parent output ID and other transaction context.
• Add a .changeset entry describing the change.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
types/policy.go	Enriches the threshold-policy verification failure message with satisfied/required counts.
consensus/validation.go	Adds extra context to the siacoin input spend-policy failure error message.
.changeset/additional_context_in_error_message_when_the_signing_threshold_of_a_spend_policy_wasnt_reached.md	Documents the change for release notes via knope changesets.

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[chatgpt-codex-connector]

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