docs: CHANGELOG.md v1.10.0 combined entry draft

[amaster97]

Summary

Drafts the combined v1.10.0 CHANGELOG entry — folds both work streams into a single MINOR bump:

• v1.9.0 Premium-A (never tagged): blueprint asset bundle (27 shards), 169-class engine (PR feat(engine): true 169-class abstraction mode (Premium-A Phase 1.5 unblock, #68) #171, 178-448x), BlueprintLoader (feat(blueprint): loader API + manifest discovery + lazy load (Phase 2, #68) #174), stack-depth interp (feat(blueprint): stack-depth interpolation module (Phase 3, #68) #173), postflop subgame wiring (feat(blueprint): postflop subgame wiring + range expansion (Phase 4, #68) #177), SolverRouter (feat(blueprint): top-level solver router (lookup / interp / live / postflop) (Phase 5, #68) #181), UI chart + chained tab (feat(ui): wire blueprint into chart widget + chained tab (Phase 6, #68) #178), vector-form BR walk (feat(engine): vector-form BR walk (W2.3 strict-PASS, opt-in) #170, W2.3 strict-PASS), B10 per-combo frequency train (feat(range): per-combo fractional weights (B10 Phase A core, #60) #149/feat(range): aggregator + solver weight propagation (B10 Phase B, #60) #154/feat(ui): per-combo intensity editor (B10 Phase C, #60) #158/feat(persona): W2.2 Sarah Range.diff per-combo verification (B10 Phase D, #60) #160), cs-bug fix (fix(engine): preflop State::initial honors config.initial_contributions (#67) #165), BB-normalization (feat(cli): v1.9.0 BB-normalization (commercial-UX parity) #152).
• v1.10 postflop optimization (task chore(gitignore): ignore transient session artifacts (release-script unblock) #70): arena allocator (PR-1 pending), vector-form turn walk (perf(engine): vector-form turn forward walk with river template (v1.10 PR-2, #70) #190), vector-form flop walk (PR-3 pending), opt-in rayon parallel chance (perf(engine): rayon opt-in parallel chance branches (v1.10 PR-4, #70) #189, 4.79x on 14-core M-series), perf benchmark harness (infra(v1.10): perf benchmark harness for speed-vs-quality Pareto (#70) #187), profiler + diff-test scaffold (infra(v1.10): flop subgame profiler + canonical diff-test scaffold (#70) #188), flop OOM measurement (docs(perf): flop subgame OOM measurement — 4-config wall+RSS sweep #186).

All 23 PRs cited with merge SHAs. 336 lines added at the top of CHANGELOG.md, above existing 1.8.x entries. Date placeholder 2026-MM-DD for tag day.

Caveats included

• Flop subgame live-solve now unblocked (was v1.9 blueprint-only) — YES
• Rayon parallelism opt-in via CFR_RAYON_CHANCE=1, bit-identical canonical path — YES
• top_k_per_side is CLASS-level filter; solver internally 1326-combo — YES
• Persona table 17/0/0/0 maintained — YES
• Deep-cap A83 Nash multiplicity carry-over — YES
• Apple Silicon arch / .dmg ad-hoc-signed carry-overs — YES

Test plan

• CHANGELOG.md inserts cleanly between ## [Unreleased] and ## [1.8.0]
• All 23 PR references resolve (per-version namespaced footnote refs v110-prNNN)
• Style matches existing v1.8.x entries (Added / Performance / Fixed / Caveats / Migration sections)
• No content in adjacent v1.8.0 entry modified
• Date placeholder filled in at ship time
• PR-1 (arena+LTO) and PR-3 (vector flop) references replaced with concrete PR # / merge SHA when those land

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