test: derive the REST client, request and fallback unit specs

[owenpearson]

PR 5 of 9 in the UTS REST unit stack. Base: uts/harness.

Derives fallback.md, rest_client.md, request.md, request_endpoint.md, stats.md,
logging.md and channels_collection.md.

Each test is a mechanical translation carrying a # UTS: <id> comment naming the
specification it came from. deviations.md gains the entries for this area.

Five tests carry @deviation: the four covering log_level and log_handler, which
Options stores and nothing reads, and RSC19b, where caller-supplied headers override the
configured Authorization.

Six are skipped outright as unobservable through the injected transport:
ConnectionManager.check_connection calls httpx.get directly, and
fallbackHostsUseDefault is not implemented — optional per TO3k7, and the specifications
scope their checks to libraries that support it.

Also recorded as specification faults: /time stubbed as an object rather than the
one-element array the endpoint returns (~24 setups across five specs), and four fallback
specifications that contradict each other or the retry rules.

Verification

257 passed, 11 skipped; ruff check ably/ test/ clean. Under RUN_DEVIATIONS=1 the five
gated tests fail as documented.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 02f925d and 04cb6d6.

📒 Files selected for processing (8)

• test/uts/deviations.md
• test/uts/rest/unit/channels_collection_test.py
• test/uts/rest/unit/fallback_test.py
• test/uts/rest/unit/logging_test.py
• test/uts/rest/unit/request_endpoint_test.py
• test/uts/rest/unit/request_test.py
• test/uts/rest/unit/rest_client_test.py
• test/uts/rest/unit/stats_test.py

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