bench: record pre-tuning baseline

Frozen baseline at commit 258463a over the full pinned day
(282,229,684 frames): framing 8,646,233 frames/s, MapBook 2,249,567
frames/s and 2,206,207 book updates/s, FastBook 4,051,042 frames/s and
3,972,959 book updates/s, a 1.80x FastBook speedup with isolated book
cost of 37.03 s against 92.82 s. Latency medians favor FastBook on
every operation group at p50, p90, and p99. The committed files are the
environment capture, the aggregated result JSON, the generated table
preview, the microbenchmark JSON, and the baseline profiling summary.

The result is labeled provisional in the JSON itself because the
machine moved to battery power partway through Day 5 and the runner
refused to call a battery run final; low-power mode was off. Two
earlier attempts were discarded and are not committed: one aborted at
the latency stage on a bash 3.2 empty-array expansion, and one carried
a spurious dirty-tree flag because the environment capture spends about
thirty seconds hashing the dataset and a source edit landed inside that
window. Their throughput numbers agreed with this one within the
within-mode pass spread.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: IpsitKalra

bench/results/2026-07-26-baseline-env.txt

@@ -0,0 +1,52 @@
+capture_local_time: 2026-07-26 17:09:45 -0400
+capture_utc_time: 2026-07-26T21:09:45Z
+host_label: Mac
+operating_system: Darwin
+kernel_release: 25.5.0
+kernel_version: Darwin Kernel Version 25.5.0: Tue Jun  9 22:27:52 PDT 2026; root:xnu-12377.121.10~1/RELEASE_ARM64_T8112
+cpu_architecture: arm64
+os_product_version: 26.5.2
+os_build_version: 25F84
+cpu_model: Apple M2
+cpu_physical_cores: 8
+cpu_logical_cores: 8
+cpu_performance_cores: 4
+cpu_efficiency_cores: 4
+memory_installed_bytes: 8589934592
+memory_free_bytes: 60719104
+memory_inactive_bytes: 1295122432
+swap_usage: total = 9216.00M used = 8005.31M free = 1210.69M (encrypted)
+power_source: Battery Power
+battery_state: -InternalBattery-0 (id=37552227) 69%; discharging; 3:21 remaining present: true
+low_power_mode: 0
+thermal_pressure: unavailable
+thermal_warnings: none recorded
+dataset_basename: 07302019.NASDAQ_ITCH50
+dataset_size_bytes: 8661679413
+dataset_filesystem: 
+dataset_sha256: 9f8634a048b8195ccdcbe618e5833a759e35e04486d74e36b79176d35172654a
+dataset_path_recorded: no (basename and checksum only, by policy)
+git_commit: 258463aa4d5fefa9dc7c1113eedda6326ac6a978
+git_short_commit: 258463a
+git_branch: main
+git_working_tree: clean
+repository: IpsitKalra/nanobook
+compiler_executable: c++
+compiler_version: Apple clang version 16.0.0 (clang-1600.0.26.6)
+build_type: Release
+release_flags_base: -O3 -DNDEBUG
+native_arch_option: ON
+lto: ON
+host_tuning_flag: -march=native
+cmake_version: 4.4.0
+cxx_standard: C++20
+cpu_pinning_available: no (taskset absent on this platform)
+cpu_pinning_used: no
+selected_cpu_core: none
+cpu_governor: unavailable on this platform
+perf_available: no
+xctrace_available: no (binary present but requires full Xcode)
+sample_utility_available: yes
+platform_class: documented macOS fallback (product_spec.md section 1)
+tsc_expected: no (no x86 TSC on this architecture)
+disk_free_bytes_repo_volume: 15498199040