docs(p037): record A2 baseline evidence at terminal-green T

Four sequential baseline snapshots (MOS repo, MOS corpus, verdict/python,
verdict/rust) taken at 4a8e658 in a
pinned measurement environment (CPython 3.11.15, .NET SDK 8.0.425, Rust
1.94.1), each independently verified against T. Evidence-only: no
instrument, treatment, spec, or CI file changes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011wKL9pEApQTK4dE3eXv8g8

Author: PhysShell

docs/evidence/p037-a2-baseline-manifest.md

@@ -0,0 +1,33 @@
+# P-037 A2 baseline manifest
+
+Terminal-green SHA T: `4a8e6582e10222403cd40adc9e95db7e0228a1c2`
+
+Four sequential baseline snapshots taken at T in measurement environment
+`P037_A2_MEASUREMENT_M1`, each independently `verify`d against T before the
+next was taken.
+
+| artifact | sha256 |
+|---|---|
+| p037-a2-baseline-mos-repo.json | `bd07e87fee7c5d9607acd3c267fec39424dee1e51662a7bba1e4949c7c5837dd` |
+| p037-a2-baseline-mos-corpus.json | `49f788f961b46f7884cde5bb06e2d35525e8ce27731d98bb5588dc550478db0b` |
+| p037-a2-baseline-verdict-python.json | `04c2fd6c75493bf90e36ac0c6c8acfbf7e692ab9a20a9d3a5591eb9be5be2d36` |
+| p037-a2-baseline-verdict-rust.json | `b9271bf7c4de111d5632a544f8d6d0710a6612aa36f682ea3a2b29dda71ac78e` |
+
+Execution profile (identical across all four takes, and identical before vs.
+after the whole sequence):
+
+- Python: CPython 3.11.15 (main, Sep 19 2026, 00:18:08) [GCC 16.1.1 20260625]
+- .NET SDK: 8.0.425, runtimes: Microsoft.AspNetCore.App 8.0.31, Microsoft.NETCore.App 8.0.31
+- Rust: rustc 1.94.1 (e408947bf 2026-03-25), cargo 1.94.1 (29ea6fb6a 2026-03-24), host x86_64-unknown-linux-gnu
+- Platform: Linux / x86_64
+
+Measurement environment identity: `P037_A2_MEASUREMENT_M1`, provisioned as an
+isolated toolchain directory (no container runtime available on the VPS);
+provisioning recipe `recipe/provision.sh` sha256
+`18fcc8f20f4032e73813a2f215f9d7440d2a7f83e4325b818df576f4ee3ad0be`, retained
+outside this repository.
+
+Taken: 2026-09-19 (UTC), operator run.
+
+This commit is evidence-only: it adds files under `docs/evidence/` and
+nothing else. No instrument, treatment, spec, or CI file is touched.