Remove unavailable OpenAI models

[simonw]

• remove 14 OpenAI model IDs that now fail against the OpenAI API
• remove the aliases that pointed at those model IDs
• rebuild the Cog-managed model, alias, and usage documentation

Refs:

• Remove deprecated OpenAI models #1553

OpenAI Codex PR body

Why

These model IDs remain exposed by llm models, but prompting them now returns either OpenAI's model_not_found response or an explicit deprecation response. Keeping them registered advertises models that users cannot successfully call.

Impact

The removed model IDs and their built-in aliases are no longer returned by llm models or resolvable through llm.get_model() / llm.get_async_model(). Historical changelog references are preserved.

Validation

• 61 focused alias/model-registration tests pass
• 683 non-embedding tests pass
• all 14 removed IDs verified absent from llm models
• Black passes for changed Python files
• mypy passes for llm
• Ruff's core error checks pass for changed Python files
• Cog rebuilt and checks the top-level generated documentation successfully

The complete local suite also exposed an unrelated SQLite 3.50 / sqlite-utils transaction incompatibility in embedding migrations; those failures reproduce outside the changed model-registration paths.

[simonw]

Ahem.

[simonw]

Cog failure:

Cogging docs/embeddings/python-api.md
  File "docs/embeddings/python-api.md", line 184, in <module>
    embeddings_migrations.apply(db)
  File "/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/site-packages/sqlite_utils/migrations.py", line 132, in apply
    with db.atomic():
  File "/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/contextlib.py", line 144, in __exit__
    next(self.gen)
  File "/opt/hostedtoolcache/Python/3.11.15/x64/lib/python3.11/site-packages/sqlite_utils/db.py", line 631, in atomic
    self.conn.execute("COMMIT")
OperationalError: cannot commit - no transaction is active

Relates to latest sqlite-utils changes.

[simonw]

I'm going to upgrade to sqlite-utils 4.0 in a separate piece of work to fix that cog problem.

[simonw]

More sqlite-migrate transaction test failures. I'm going to pin to sqlite-migrate==0.1a2 to get this PR to pass, then I'll fix in #1555.