test: derive the channel unit specs

[owenpearson]

PR 7 of 9 in the UTS REST unit stack. Base: uts/derive-types-encoding-presence.

Derives channel/publish.md, publish_result.md, history.md, get_message.md,
update_delete_message.md, message_versions.md, annotations.md, idempotency.md and
rest_channel_attributes.md.

Three tests carry @deviation: the two covering RestChannel#setOptions, where the
REST channel's options setter expects the kwargs dict Channels.get collected and so
raises TypeError on a ChannelOptions; and RSL1i, where a REST publish never checks the
message size — the helper exists and only the realtime channel calls it.

Two carry @spec_error: RSL1c asserting an object payload travels unstringified,
which RSL4c3 and RSL4d3 contradict, and RSL1k/mixed-ids-in-batch-1 expecting a generated
id that RSL1k1 and RSL1k3 between them rule out.

The adapted tests record the channel name encoding as it stands, which is where this area
holds two genuine correctness issues: a space travels as + rather than %20, from
quote_plus in Channel.__init__ — form encoding applied to a URL path — and
Channel#status interpolates the name with no escaping at all, so a/b addresses the
wrong resource. Both are recorded rather than fixed here.

Verification

453 passed, 29 skipped; ruff check ably/ test/ clean.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 0914300 and 9e3095b.

📒 Files selected for processing (11)

• test/uts/deviations.md
• test/uts/rest/unit/channel/__init__.py
• test/uts/rest/unit/channel/annotations_test.py
• test/uts/rest/unit/channel/get_message_test.py
• test/uts/rest/unit/channel/history_test.py
• test/uts/rest/unit/channel/idempotency_test.py
• test/uts/rest/unit/channel/message_versions_test.py
• test/uts/rest/unit/channel/publish_result_test.py
• test/uts/rest/unit/channel/publish_test.py
• test/uts/rest/unit/channel/rest_channel_attributes_test.py
• test/uts/rest/unit/channel/update_delete_message_test.py

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