ci: validate documentation and run the Scribe suite on PRs

[logbie]

Summary

Scribe has no Actions workflow on baseline b3c6673. Add observable documentation and runtime checks for main/dev PRs under the approved LOG-16 readiness assignment.

Changes

Documentation checks validates changed Markdown whitespace, nonempty README/SYNTAX/DESIGN entry points and syntax of documented shell runners. It does not validate Markdown links, prose accuracy or accessibility; those remain review responsibilities. Scribe tests runs the existing complete WFL test file in a disposable copy with no network or credentials, recording the resolved nightly image digest and runtime version.

Compatibility and risk

R1: CI only. No application, release/deploy, credential, branch-setting or production changes. Existing Scriptorium provisioning uses the same official nightly image; each run records its resolved digest. PRs require both successful jobs before adding these names to a required-check proposal. Existing controls remain unchanged.

Validation

Baseline has no workflow: no failing Actions run is possible before adding one. Existing Scribe behavioral regressions are retained, without skips or relaxed assertions. YAML parsing, separate bash -n calls for each runner, and diff whitespace validation pass locally. No local WFL/Docker runtime is available; both jobs pass on current head 87d26e879dc590e25477ccc5825714b623de097a: Actions. This adds check wiring, not new validation algorithms.

Checklist

• Own feature branch targets dev, as authorized for the governance rollout.
• Read-only token; checkout credential persistence disabled; no secrets consumed.
• Both current-head Actions jobs pass.
• Yomi review and bot findings dispositioned.
• Independent approval satisfied. No merge or bypass authorized.

Devin finding corrected: the initial multi-file bash command checked only the first file. A local negative fixture demonstrated old exit 0 versus independent syntax-check exit 2; fixed both commands and reran Actions. No failing Actions run is claimed for that local reproduction.

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[devin-ai-integration]

Devin Review found 1 potential issue.