formula-analytics: replace PyCall with subprocess

[MikeMcQuaid]

• pycall was Homebrew's only in-process Python embedding: a native gem that dlopens libpython, needed the __PYVENV_LAUNCHER__ hack for macOS framework Pythons, hand-written Sorbet stubs and tapioca/RuboCop exclusions.
• A pure Ruby HTTP port was rejected: InfluxDB Cloud Serverless only serves SQL over Arrow Flight gRPC (it has no /api/v3/query_sql endpoint) and the analytics schema keeps package, tap_name and options as fields, which InfluxQL cannot GROUP BY; Flux is deprecated on InfluxDB 3. Ruby Flight clients need heavier native dependencies than pycall itself.
• Moving the whole query operation into Python was rejected: the JSON output depends on Homebrew::EnvConfig defaults, MacOSVersion pretty names and WSL suffix handling that would drift if duplicated outside Ruby.
• influxdb-query.py runs from a uv-managed virtualenv with the same pinned influxdb3-python and speaks a documented protocol: a JSON request on stdin, JSON Lines rows on stdout and the token read from HOMEBREW_INFLUXDB_TOKEN so credentials stay off the command line.
• Arrow record batches now stream via mode="reader" instead of being copied record-by-record across PyCall's FFI bridge.
• Python dependencies moved from pip-compiled requirements.txt to pyproject.toml and a hash-verified uv.lock installed with uv sync --frozen: uv is a single dependency-free bottle installed 2.5x as often as versioned Python formulae, replaces the five bottles python@3.13 needed and cold-installs the whole virtualenv faster than pip installed the packages alone, so actions/setup-python and dependabot's pip ecosystem are replaced by astral-sh/setup-uv and the uv ecosystem.
• uv also provisions the interpreter: .python-version pins 3.14, the newest Python in Homebrew, and requires-python = ">=3.13" keeps future bumps to a one-line .python-version change.
• brew formula-analytics --setup still prepares everything for offline runs and verifies the bridge import via the script's --check flag.
• brew verify-undefined also guards InfluxDBClient3 and PyCall after requiring dev-cmd/formula-analytics.
• The TSM-era transform_analytics_to_counts.json Flux task was referenced by nothing so is removed.

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Claude Fable 5 max with local review and testing.

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[Copilot]

Pull request overview

This PR removes Homebrew’s in-process Python embedding (PyCall) from brew formula-analytics and replaces it with an out-of-process Python bridge script invoked via subprocess, with Python dependencies managed by uv (including lockfile support). It also updates CI and dependency automation to align with the new Python toolchain approach.

Changes:

• Replace PyCall-based InfluxDB querying with a stdin/stdout JSON protocol to a uv-managed Python virtualenv and bridge script.
• Remove the pycall gem and associated Sorbet/Tapioca configuration and stubs.
• Add uv project files (pyproject.toml, uv.lock, .python-version) and update CI (setup-uv) and Dependabot (uv ecosystem).

Reviewed changes

Copilot reviewed 18 out of 22 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Library/Homebrew/vendor/bundle/bundler/setup.rb	Removes PyCall load paths from vendored bundler setup.
Library/Homebrew/test/support/helper/cmd/brew-verify-undefined.rb	Adds post-require undefined-constant guards for formula-analytics-related constants.
Library/Homebrew/test/dev-cmd/formula-analytics_spec.rb	Updates existing specs for the new query pathway and adds tests for the bridge protocol/error handling.
Library/Homebrew/sorbet/tapioca/require.rb	Stops special-casing/ignoring pycall during Tapioca requires.
Library/Homebrew/sorbet/tapioca/config.yml	Removes pycall from skipped gem RBI generation list.
Library/Homebrew/Gemfile.lock	Drops pycall from the Ruby dependency lockfile.
Library/Homebrew/Gemfile	Removes the optional :formula_analytics gem group that included pycall.
Library/Homebrew/formula-analytics/uv.lock	Adds a locked, hash-verified uv dependency set for the Python environment.
Library/Homebrew/formula-analytics/transform_analytics_to_counts.json	Removes an unused legacy Flux task file.
Library/Homebrew/formula-analytics/requirements.txt	Removes pip-compiled requirements in favor of uv.lock.
Library/Homebrew/formula-analytics/requirements.in	Removes the pip-compile input file.
Library/Homebrew/formula-analytics/pyproject.toml	Adds uv/PEP 621 project metadata and dependencies.
Library/Homebrew/formula-analytics/pycall-setup.rbi	Removes PyCall/InfluxDBClient3 Sorbet stubs no longer needed.
Library/Homebrew/formula-analytics/pycall-setup.rb	Removes PyCall-based import/setup code.
Library/Homebrew/formula-analytics/influxdb-query.py	Adds the Python bridge script implementing the stdin request / JSONL response protocol.
Library/Homebrew/formula-analytics/.python-version	Updates pinned Python version for the uv environment.
Library/Homebrew/dev-cmd/formula-analytics.rb	Switches formula-analytics to uv sync + subprocess bridge execution and updates --setup semantics.
Library/.rubocop.yml	Removes pycall-related RBI path exclusion.
completions/zsh/_brew	Updates --setup completion description to Python/uv semantics.
completions/fish/brew.fish	Updates --setup completion description to Python/uv semantics.
.github/workflows/tests.yml	Replaces actions/setup-python usage with astral-sh/setup-uv for formula-analytics CI.
.github/dependabot.yml	Switches dependency updates from pip to uv ecosystem for formula-analytics.

Files not reviewed (1)

• Library/Homebrew/formula-analytics/pycall-setup.rbi: File type not supported

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[p-linnane]

Very nice!