fix: backport #21687 — only delete logs from rolled-back blocks, not entire tag (A-686)

[AztecBot]

Summary

Backport of #21687 to v4.

During reorg, deleteLogs was deleting the entire log entry for a tag instead of only removing logs from the rolled-back blocks. This caused logs from earlier blocks to be lost.

Cherry-pick conflicts

The automatic cherry-pick failed due to API differences between next and v4:

• next uses store.addProposedBlock(block) (singular) — v4 uses store.addProposedBlocks([block]) (plural, takes array)
• next uses a helper addProposedBlocks(store, ...) — adapted to call store.addProposedBlocks(...) directly in v4

Commit structure

1. Cherry-pick with conflicts — raw cherry-pick preserving conflict markers
2. Conflict resolution — adapted addProposedBlock → addProposedBlocks API calls

Fixes https://linear.app/aztec-labs/issue/A-686

ClaudeBox log: https://claudebox.work/s/1f9640fef77e1838?run=2