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docs: correct the scheduler design's table-count assumption - #365
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Review round 5 measured production: 13,405 tables, ~354 with pending WAL, 318 generic, 6 masters. The design assumed tens to low hundreds of active tables, two orders of magnitude off, and that assumption drove the unpaged etcd reads and the token byte reservations fixed in lance-format#364. Correct §2, §4.5 and §6, and mark the first open question answered. Refs lance-format#333. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Part of #333. Follow-up to #364.
Review round 5 measured production: 13,405 tables, ~354 with pending, 318 generic, 6 masters. The design assumed "tens → low hundreds active" — wrong by two orders of magnitude — and that assumption directly produced the unpaged etcd reads and 1-byte reservations fixed in #364.
Corrects §2 (workload table, with the error acknowledged), §4.5 (per-cycle cost now stated with paging and measured at production shape), §6 (when the single leader would need watch-driven folding or sharding), and marks backlog open question 1 answered.
Docs only; typos clean.
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