test: derive the type, encoding and presence unit specs

[owenpearson]

PR 6 of 9 in the UTS REST unit stack. Base: uts/derive-client-request-fallback.

Derives encoding/message_encoding.md, encoding/msgpack_interop.md,
presence/rest_presence.md, and the types specifications for messages, mutable messages,
options, presence messages, tokens, paginated results and errors.

The msgpack interop tests read fixtures from ably-common, which the pinned submodule
predates, so they are gated on the fixture file being present.

Ten tests carry @deviation: the presence get filters (clientId, connectionId),
PresenceMessage#size, href and cause on a deserialised error, the presence attributes
a ProtocolMessage would supply, and endpoint left unset when none is given.

Three carry @spec_error: two TP3 cases asserting an outgoing presence action as the
string "enter", and RSP4/history-pagination-1 asserting wire action 4 is LEAVE, both
of which protocol.md contradicts.

The adapted tests record ErrorInfo equality by identity, capability as a Capability
object rather than stringified JSON, and PaginatedResult.headers as a list of pairs —
each with the specification's expectation in a comment above and a note on whether it is
intentional or an open bug.

Verification

395 passed, 24 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 04cb6d6 and 25c757d.

📒 Files selected for processing (14)

• test/uts/deviations.md
• test/uts/rest/unit/encoding/__init__.py
• test/uts/rest/unit/encoding/message_encoding_test.py
• test/uts/rest/unit/encoding/msgpack_interop_test.py
• test/uts/rest/unit/presence/__init__.py
• test/uts/rest/unit/presence/rest_presence_test.py
• test/uts/rest/unit/types/__init__.py
• test/uts/rest/unit/types/error_types_test.py
• test/uts/rest/unit/types/message_types_test.py
• test/uts/rest/unit/types/mutable_message_types_test.py
• test/uts/rest/unit/types/options_types_test.py
• test/uts/rest/unit/types/paginated_result_test.py
• test/uts/rest/unit/types/presence_message_types_test.py
• test/uts/rest/unit/types/token_types_test.py

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