Default index-leaf lookahead on; simplify docs#44
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The scope fix (PR #43) made lookahead byte-identical to off for scans, point-by-rowid reads, and warm queries -- it only engages for indexed SEARCH into a table. With the harm gone and the wins measured (index-> table joins ~20-32% faster cold, fan-out reads up to ~46% lower p90 and ~19% fewer bytes, scans unchanged), flip the default to on. - config: lookahead defaults to true; doc comment updated. - README design note: shortened. - README tuning: replace the stale 'default-off, can hurt scans' guidance with an Index-leaf lookahead section -- on by default, only the fully-warm CPU-bound case is a reason to disable it. - CHANGELOG: Ranger entry. Full lib suite + config_set_per_handle green with default-on. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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The scope fix (#43) made lookahead byte-identical to off for scans, point-by-rowid reads, and warm queries — it only engages for indexed SEARCH into a table. With the harm gone and the wins measured, flip the default on.
config.rs:lookaheaddefaults to true.Full lib suite (587) + config_set_per_handle (6) green with default-on.
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