`profileOf(pk)` and `relaysOf(pk)` are the two hottest read patterns
in any Nostr client, both expressed as `Filter(authors=[pk],
kinds=[0|10002])`. Before this change every such query walked
`idx/kind/<k>/`, sorted the listing, and probed candidates — O(N)
in the kind's total event count even though we always wanted exactly
one event.
The planner now intercepts before the directory walk: when a filter
pins us to replaceable / addressable kinds with `authors` (and
`d`-tag for addressables), we read the slot file directly. One
`Files.exists()` + one `readString()` per (kind, author[, d]) triple,
no listing, no sort.
Falls through to the generic walk for anything that doesn't fit
(non-uniqueness kinds, missing d-tag, search clause, etc.). Two
new tests in FsSlotsTest assert the shortcut serves correctly
even when `idx/` has been externally wiped — proving the
shortcut isn't accidentally relying on the index.
115 fs tests green.
Claude
d460584d81