core+build: MainThreadExecutor::runOnce()/drain(); suppress -Wthread-safety-negative on Clang 22 #146

	name: Drift guard

	# Two independent gates for the "spec <-> code drift" class of bug (a
	# docs/spec/*.md file stating a mechanical fact -- an enum cardinality, a
	# constant, a canonical error string, a glaze parsing flag -- that silently
	# stops matching the code):
	#
	# 1. The compiled pinned-facts test (tests/test_pinned_facts.cpp) needs no
	# job here: it is already part of the `morph_tests` target, so it runs
	# in every job of the main CI workflow (.github/workflows/ci.yml) for
	# free, and benefits from running under every compiler in that matrix
	# (GCC, Clang, MSVC, clang-cl) since the enum-cardinality switch pins
	# (see tests/test_pinned_facts.cpp) rely on compiler-specific warning
	# behavior that is worth exercising on all of them, not just one.
	# 2. The prose-vs-manifest lint (scripts/check_spec_citations.sh) is a
	# repo-wide text scan, unrelated to compilation -- it runs here, in its
	# own fast, dependency-free job.
	#
	# Unlike .github/workflows/spec-sync.yml, this gate has no "no docs update"
	# label escape hatch: a wrong citation or a reintroduced banned term is never
	# a legitimate state to merge, so there is nothing to opt out of.

	on:
	push:
	branches: [main, master]
	pull_request:

	permissions:
	contents: read

	jobs:
	prose-lint:
	name: Spec-citation & banned-terminology lint
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/checkout@v4

	- name: Run prose-vs-manifest lint
	run: bash scripts/check_spec_citations.sh

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