docs: retire algo-review.md into quality.md

[rearden-grok]

Summary

• Delete docs/algo-review.md. It was a second backlog (inventory + gotchas + micro-opts + a Closed-shaped dump) next to the living Open list.
• File the leftovers that are actually worth doing as Q-57–Q-60 in docs/quality.md, ranked above blocked/lint work:
  • Q-57 store publish / Class C flush / sidecar (seqlock fences, lost dirty flush, fuse8 OOB, spender cycle, sidecar fsync, runs_io)
  • Q-58 mempool persist order + eviction (body-before-LIVE, out-of-range vout, rate-tie strand, evict_to_budget spin)
  • Q-59 RPC/CLI honesty (submitblock vs docs, gettxout include_mempool, ignored maxfeerate/maxburnamount, conf milestone=0, --minrelaytxfee, blockmintxfee, getnetworkhashps, unbounded JSON-RPC batch)
  • Q-60 P2P caps + compact reconstruction (prefilled indexes, AddrMan, cmpct_fills, announced_wtx, FIFO eviction, Esplora WS off tokio, IBD disconnect_to skip)
• Won't-fix the rest: package-level feerate (COMPAT), Esplora /blocks reconstruct + chained mempool stats, and the micro-opt list (reopen a named Q-id only with a mainnet profile).
• Map / CHANGELOG / AGENTS.md stop pointing at the deleted file. Do not resurrect docs/algo-review.md.

Not copied

Crate inventory, “checked and found sound,” gotchas that already live in owner docs (invariants.md, COMPAT, SCHEMA), and High-empty / work-order prose.

Other docs that look ripe (not this PR)

• docs/errata.md — one fact (leftover maps txid → one fk). Already stated in invariants.md leftover union and in quality.md Won't-fix. Fold into invariants.md and delete.
• docs/peer-clients.md — same shape as algo-review (dated snapshot, ranked later-consideration, “do not copy into quality.md”). Highest steal is already Q-30. Keep until ranks 2–5 are promoted or won't-fixed; then the comparison can live as a short pointer in architecture.md.
• Not ripe: mempool-fee-estimation.md (owns the 10-minute inclusion product), experimental-mainnet.md (0.5 runbook), rust-bitcoin-limitations.md, env-knobs.md, road-to-1.0.md.

Test plan

• Docs-only; no production change
• Required Actions green (fmt, deny, clippy, ast-grep, test, windows, macos, multinode, coverage)

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