Rename package from httpcore to httpcore2

[Kludex]

Summary

Renames the workspace-vendored httpcore to httpcore2, mirroring the earlier httpx -> httpx2 rename.

Changes:

• src/httpcore/ -> src/httpcore2/, and the inner httpcore/ package -> httpcore2/.
• All import httpcore / from httpcore / httpcore.X references rewritten to httpcore2 in workspace source, tests, and httpx2 callers.
• src/httpcore2/pyproject.toml: name = "httpcore2", version path, sdist include, coverage include, ruff exclude.
• Root pyproject.toml: dependencies and dev group now reference httpcore2; workspace member + source point to src/httpcore2.

Upstream docs/URLs/README/CHANGELOG branding left as-is (import-name-only rename).

Test plan

• uv lock resolves clean (httpcore removed, httpcore2 added).
• uv sync builds both editables.
• import httpcore -> ModuleNotFoundError; import httpcore2 works.
• scripts/lint, scripts/check pass.
• uv run pytest -> 1417 passed, 1 skipped, 0 failed.
• CI green on all Python versions.

AI Disclaimer

This PR was developed with the assistance of either Claude or Codex. I've reviewed and verified the changes.

[chatgpt-codex-connector]

💡 Codex Review

httpx2/src/httpcore2/scripts/unasync.py

Line 86 in 883ce6f

unasync_dir("httpcore/_async", "httpcore/_sync", check_only=check_only)

Point unasync at the renamed package directory

After moving the package to httpcore2/, this still walks httpcore/_async, which no longer exists under src/httpcore2. As a result, the script stops validating/regenerating the package sync code and (in --check mode) exits non-zero because substitutions remain unused; this breaks the scripts/check step used by src/httpcore2/.github/workflows/test-suite.yml.

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httpx2/src/httpcore2/scripts/check

Line 7 in 883ce6f

export SOURCE_FILES="httpcore tests"

Run lint/check against the renamed source package

SOURCE_FILES still references httpcore, but the repository now contains httpcore2 in this subtree. That means scripts/check and scripts/lint no longer target the actual package code (and can fail on missing paths), which breaks the quality gate invoked by src/httpcore2/.github/workflows/test-suite.yml.

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httpx2/src/httpcore2/scripts/publish

Line 3 in 883ce6f

VERSION_FILE="httpcore/__init__.py"

Read version from the renamed package path in publish

The publish script still reads httpcore/__init__.py for the version, but that file no longer exists after the rename. In tagged CI runs, scripts/publish (called by src/httpcore2/.github/workflows/publish.yml) will fail before upload because the version grep targets a missing file.

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