Review/optimize checklist, executive-summary format, build executor (T02-T04)

docs/review-optimize-checklist.md: six checks (naming, TTL/scoping,
redundancy, compaction, ease of use, posture), applied for real to the
rein-openweights plan's section 4 -- including a genuinely useful
finding (credentials.py already expects this exact path/delivery shape,
zero code changes needed to consume it).

docs/executive-summary-format.md: six fixed fields, no bao syntax, no
restating earlier sections, explicit approve/reject/revise decision.
Rendered for real into the plan's section 5 -- ready for an actual
decision.

src/ops_mason/{plan,executor,audit}.py: the phase-4 build executor for
credential_type openbao-approle-kv. Refuses to run against anything but
an approved plan -- verified the refusal never even calls subprocess.run.
role_id/secret_id (the AppRole's own access credential, not the
downstream secret) land as 0600 files, never logged; the HCL policy
goes over stdin, never argv; the audit trail is metadata-only. 12 tests,
all mocked at the bao boundary (no live OpenBao access from this
session).

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

pyproject.toml

@@ -0,0 +1,22 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "ops-mason"
+version = "0.1.0"
+description = "Builder of NetKingdom security infrastructure (AppRoles, policies, KV paths) for ops-warden to route to"
+requires-python = ">=3.11"
+dependencies = [
+    "PyYAML>=6.0",
+]
+
+[project.optional-dependencies]
+dev = ["pytest>=8"]
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/ops_mason"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+pythonpath = ["src"]