When creating issues with explicit IDs via PrefixOverride (for cross-rig
creation), the storage layer was still validating against the local
config prefix, causing errors like:
issue ID 'da-DataArchive-witness' does not match configured prefix 'hq'
The queries.go layer already handled PrefixOverride correctly, but
transaction.go did not. This fix adds the same PrefixOverride handling
to transaction.go:
1. Check if PrefixOverride is set
2. If set, use it as the prefix and skip validation (caller knows best)
3. Otherwise, fall back to existing IDPrefix/configPrefix logic
This allows gt doctor --fix to create agent beads for non-local rigs.
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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