[lesnik512]

Part of #314: the 1.x half. The 2.0 half, which deletes the names, stays open on the issue.

Every old name still resolves to the same object, but accessing it now emits a DeprecationWarning that names the replacement and says 2.0 removes it:

Old name	Where it warns	Use instead
OpentelemetryConfig	opentelemetry_instrument	OpenTelemetryConfig
FreeBootstrapperConfig	free_bootstrapper and lite_bootstrap	FreeConfig
IGNORED_STRUCTLOG_ATTRIBUTES	sentry_instrument	logging_factory.STRUCTLOG_META_KEYS
AddressProtocol, RequestProtocol, ScopeType	logging_factory and logging_instrument	nothing
not_ready_message, check_dependencies on an instrument subclass	at class creation	not_configured_reason, dependencies_installed

How it works:

• helpers.warn.deprecated_module_getattr builds each module's __getattr__. It goes through warn_at_caller, so the warning points at the user's import line rather than at lite-bootstrap.
• Each alias keeps a typing.TYPE_CHECKING definition. Without it, a type checker would see only the module __getattr__ and lose the alias's type, which would be a typing regression in a minor release. I checked that ty still resolves every old name.
• FreeBootstrapperConfig is gone from lite_bootstrap.__all__, and the protocols from logging_instrument.__all__, so from ... import * stays silent. A test covers that.
• In logging_factory the protocols now live under private names, so they warn there as well and not only through the logging_instrument re-export.
• BaseInstrument.__init_subclass__ warns only when it actually forwards a legacy name. With @dataclass(slots=True) the class gets created twice. By the second time the current name is already in the class dict, so the warning fires once.

tests/conftest.py: emulate_package_missing_with_module_reload wiped and restored only non-dunder globals. After a reload it put back the original OpenTelemetryConfig but kept the reloaded module's __getattr__, which still held the reloaded class, so the alias stopped being identical to its target. The helper now treats __getattr__ as module state.

Not in this PR: the AGENTS.md rule "a public rename ships a silent alias" is now out of date, and its worked example (OpentelemetryConfig) no longer matches. #323 owns that text.

Verified: 422 tests pass at 100% coverage, just lint is clean, and a script outside the package gets each warning on its own import line. No new warnings appear in the suite; the remaining 16 come from Litestar and FastAPI.