phase0: dry run — comrak & tokei vendored, 3 attempts in ledger

Target selection (SPEC §6): comrak 0.53.0 (45c1995, BSD-2-Clause) and
tokei 14.0.0 (fa44e51, MIT/Apache-2.0); both CPU-bound with pinned
corpora (progit book 11MB; 8x replicated pinned trees, 221MB) and
committed MANIFEST.sha256 + golden-output pins + regen scripts.

Calibration: A/A null verdicts on both real workloads; taskset -c 2
pinning tightens the A/A CI from [0.938, 1.008] to [0.993, 1.008],
making the 2% accept threshold meaningful in this container.

Profiles (callgrind; perf unavailable): comrak allocator symbols 26.7%
of Ir; tokei perform_multi_line_analysis 31.7%.

Attempts (ledger + results/phase0/):
- comrak class-1 target-cpu=native: null [0.983, 1.011], rejected-bench
- comrak class-2 mimalloc swap: +4.6% [1.033, 1.058], 848 upstream
  tests green, golden byte-identical, ASan-proper clean; LSan flags
  484B in onig (reachability false-positive analysis in case study) ->
  needs-human-review per SPEC §8
- tokei class-1 fat LTO+cgu=1: +1.6% [1.003, 1.026], real but under
  the 2% bar, rejected-bench

Also: ledger-cli for manual rows, targets/ excluded from trust-layer
workspace, corpora/build artifacts gitignored, case study written.
Phase 0 exit criteria (>=10% verified win) not yet met; next
hypotheses logged in results/phase0/attempts.md.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EcKPWQ3MQD4NdEHwar96u2

results/phase0/comrak-mimalloc.patch

@@ -0,0 +1,39 @@
+diff --git a/Cargo.toml b/Cargo.toml
+index bd1dfe9..fcc70f3 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -69,7 +69,7 @@ phf_codegen = "0.13"
+ 
+ [features]
+ default = ["cli", "syntect-onig", "bon"]
+-cli = ["clap", "bon", "shell-words", "xdg", "fmt2io", "shortcodes", "phoenix_heex", "attributes"]
++cli = ["clap", "bon", "shell-words", "xdg", "fmt2io", "shortcodes", "phoenix_heex", "attributes", "mimalloc"]
+ shortcodes = ["emojis"]
+ phoenix_heex = []
+ attributes = []
+@@ -107,6 +107,7 @@ clap = { version = "4", optional = true, features = [
+     "string",
+     "wrap_help",
+ ] }
++mimalloc = { version = "0.1", optional = true }
+ 
+ [[example]]
+ name = "syntect"
+diff --git a/src/main.rs b/src/main.rs
+index 6c5b2a6..a439fb7 100644
+--- a/src/main.rs
++++ b/src/main.rs
+@@ -10,6 +10,13 @@ use std::{boxed::Box, io::BufWriter};
+ 
+ use clap::{Parser, ValueEnum};
+ 
++// The CLI churns many small AST allocations; mimalloc services them with
++// far fewer instructions than glibc malloc. Library consumers are
++// unaffected: this only applies to the comrak binary.
++#[cfg(not(target_arch = "wasm32"))]
++#[global_allocator]
++static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
++
+ use comrak::options;
+ use comrak::{Arena, Options};
+ #[cfg(feature = "syntect")]