[JarryShaw]

• Searched for similar pull requests
• Followed the coding style (make pylint, make mypy, make isort)
• make test passes, and a test case covers the change
• Changelog entry: N/A — centralised in docs(changelog): shared 1.5.0 changelog — long-lived, merges last (#610, #616, #617, #618, #620) #657

What is the purpose of your pull request?

• docs — documentation only

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Description of your pull request and other information

Adds docs/source/glossary.rst for the words with several meanings: registry, schema, data model, info and default engine (#1949). Each entry names its senses and links to the page that explains them, so it never repeats an explanation. The page sits between demo and changelog.

• Ambiguous mentions on the engine, extraction, constants, test-coverage and protocol pages and docstrings link to it with :term:.
• Protocol.info now says it returns a data model rather than an "Info dict". The wording of info_name, schema and NoPayload._info is changed to match.
• ext.rst gains an ext-new-protocol label for the glossary to link to.

tests/project/test_docs_glossary_1949_unit.py pins the page, its entries and links, and that every :term: role resolves, since CI's make html only warns on an unknown term. It fails on main. The docs build has no warnings.

Closes #1949

[JarryShaw]

NEEDS CHANGES at b6350a74d, one sentence. A Sonnet review checked each entry's senses against the code: Protocol.info/info_name, the default-engine fallback and magic-number choice, EnumMeta.registry, and reasm.tcp.packet. All of them hold. The docs build has 0 warnings, with no duplicate-term clash against the existing glossaries. Every :term: resolves, and the new test fails on main. The one fix is the info entry's "which the enclosing layer's holds under". It is missing its noun and is being reworded in a follow-up commit.

[JarryShaw]

GOOD TO GO at f3a65c536. A Sonnet delta review confirmed the new commit touches only glossary.rst. The info entry now reads correctly and matches Protocol.info_name in protocol.py, and all five entries read cleanly. The glossary test passes.