test(bidi): align media authority contract

[seonghobae]

Summary

• repair stale source-contract assertions after fix(bidi): make reusable application scope explicit #298 removed the unsafe reusable SetReducedMotion command
• retain the positive assertion that standard BiDi advertises the reduced-motion capability while requiring that the reusable command enum does not mint mutation authority
• record the reusable test-maintenance rule in AGENTS.md and CLAUDE.md

Traceability

• Successor to the exact-head review finding on fix(bidi): make reusable application scope explicit #298: fix(bidi): make reusable application scope explicit #298 (comment)
• Stacked on fix(bidi): make reusable application scope explicit #298 exact 369add64ea285497e9fa3f706ba85ba205adff80.
• This repairs test truth only; it does not add browser transport, media mutation, Chromium evidence, or protected-main behavior.

Verification

• RED at fix(bidi): make reusable application scope explicit #298 head: uv run pytest tests/test_bidi_media_authority_contract.py tests/test_webdriver_bidi_presentation_adapter_contract.py -q produced 2 failures because both older assertions still required SetReducedMotion.
• GREEN: same command reports 8 passed, 3 subtests passed; cargo test -p originweave-bidi --locked; cargo clippy -p originweave-bidi --all-targets --all-features -- -D warnings; RUSTDOCFLAGS='-D warnings' cargo doc -p originweave-bidi --no-deps --locked; git diff --check.

No release, deployment, merge, Chromium runtime, or complete-coverage claim is made.

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