`Automation::to_toml_string` and the `to_persisted` helper it wrapped
have had no production callers since automations moved from
`<storage>/automations/*.toml` into SQLite. Writes now serialize through
`canonical_bytes` for revision hashing; nothing renders an `Automation`
back to a TOML document.
Repoint the canonicalization test at `parse_persisted` + `canonical_bytes`
so it exercises the production path that actually produces the bytes the
revision hash is computed over.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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