## Problem

Snapshot file-version checks only rejected files that were **too old**.
Files that were **too new** passed the check and got read with the wrong
parser.

Example: binary supports up to `v2.1`, directory contains
`v3.0-storage.0-32.efi` — opened silently, no error.

## Solution

Check both bounds in `Versions.MustSupport` and fail fast:

- **Too old** → suggests `erigon snapshots reset`.
- **Too new** → suggests upgrading Erigon, or `erigon snapshots reset`
to align.

Logged once via `sync.Once` (parallel goroutines don't duplicate the
banner), then panics. Callsites in `dirty_files.go` and `block_types.go`
migrated; `VersionTooLowPanic` and its local twin deleted. Unit tests
cover in-range, too-low, and too-high.