test: guard shipped drift claims in docs

[jaruesink]

What

Add a narrow docs/reality contract for Anvil's shipped Phase 1 drift checks.

Why

SFR-408, SFD-331, and the current Anvil cycle surfaced repeated documentation claims that shipped capabilities were still planned or not implemented. This guard catches that regression with exact file and line evidence while allowing the planned Phase 2 coverage-gap work.

Proof

• Current README and drift design docs pass the contract.
• A seeded Command drift detection is planned claim fails with the source file and line.
• A planned coverage-gap phase is not misclassified.
• bun run lint
• bun run format:check
• bun run typecheck
• bun test (356 passing)

Tracking

• Linear: SFE-1043

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📥 Commits

Reviewing files that changed from the base of the PR and between 38cfd8f and e4109da.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• scripts/docs-reality-contract.test.ts
• scripts/docs-reality-contract.ts

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