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Closes #786 and #789, bundled because working either alone would build the artifact the other removes. Every job in all six tracked workflows declares `env.CI_JOB_ROLE` (guard/report-only/none); the `docker-build.yml` jobs also declare `env.CI_EXECUTION_CLASS` (toolchain/bare-runner). Both guard populations derive from those markers; the `TOOLCHAIN_JOBS`/`BARE_RUNNER_JOBS` literals are deleted. A missing or unrecognised marker is a hard failure in both checkers. #789's literal had a real justification — set equality between two DERIVED sets is blind to a member leaving both at once — so the marker is the anchor that replaces it, and the cost (proximity to the `container:` block) is paid by a THIRD derivation from each job's own steps, which is also the only check that sees the failure #789 filed: a .NET step moved into a bare-runner job, where no set changes. The residual is disclosed: drop the block, flip the marker AND hide the tool behind a script and all three go blind, bounded by the failure mode being a loud missing-binary crash. #786's guard jobs join a machine-checked population: a new `test_workflow_job_guards.py` asserts set equality both ways against a new "Workflow-job guards" table, and the four jobs with no dropped-step guard each carry a recorded decision. Two issue claims were refuted by measurement: #789's "editing docker-build.yml re-points the pin" (the pathspec is `docker/ci` only) and #786's job count (17, not 15). Four cold adversarial review rounds across two model families; rounds 1-3 BLOCKED, all findings fixed and each fix demonstrated by reproducing the reviewer's own test. The recurring defect class was prose drifting from code, including a mechanism claim in the decision record that execution refuted. All five mutation proofs redden when their shipped detector is disarmed. New decision record: `testing.workflow-declares-its-own-job-metadata`. Co-authored-by: Timothy <timothy@noreply.gitea.tblindustries.be>