Bring lambda Python in line with project conventions; build lambdas in CI

[mattgodbolt]

These lambdas don't get much attention, so this is some low-risk housekeeping to slow the bitrot. No behavior change to deployed functions beyond the utcnow fix; nothing here deploys.

Python conventions

The lambda/ subdir had its own ruff config (E,W,F,B,I) that was laxer than the root project, which is why it drifted. This aligns it with root:

• Add FA, UP, PLC, BLE001 to the ruff select, and require from __future__ import annotations via isort required-imports.
• Apply the fixes: future-annotations imports across all files, PEP 585/604 typing (dict, X | None), and datetime.UTC.
• Replace deprecated datetime.utcnow() with timezone-aware datetime.now(datetime.UTC) in stats.py (output for the strftime keys is unchanged; tests still pass).

Python runtime is already 3.12 across root and lambda, matching a current supported Lambda runtime, so no version change needed.

CI bitrot guard

python-tests.yaml ran make test and make static-checks but never built the lambda packages -- so dependency-resolution or packaging breakage only showed up at deploy time. Added a build-only step (make lambda-package events-lambda-package); it does not upload to S3 or run terraform.

Validation

• make static-checks clean
• uv run pytest lambda/ -- 25 passed, 1 skipped
• both zips build via the exact CI command

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR performs low-risk housekeeping on the lambda/ Python code to match the repository’s Python conventions (ruff/isort rules, modern typing, and timezone-aware datetimes), and updates CI to build both Lambda ZIP artifacts to catch packaging/dependency issues earlier.

Changes:

• Align lambda/ linting with the root project by expanding ruff rule selection and enforcing from __future__ import annotations via isort required imports.
• Apply automated modernization fixes across Lambda sources/tests (PEP 585/604 typing, future annotations import, and datetime.UTC usage), including replacing deprecated utcnow() with timezone-aware now(datetime.UTC) in stats.py.
• Extend the Python CI workflow to build both lambda-package and events-lambda-package artifacts (build-only, no deploy).

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lambda/status.py	Adds future-annotations import and switches timestamp generation to datetime.now(UTC) for UTC-aware timestamps.
lambda/status_test.py	Adds future-annotations import to comply with enforced isort required imports.
lambda/stats.py	Modernizes typing annotations and replaces deprecated utcnow() with now(datetime.UTC) (UTC-aware).
lambda/stats_test.py	Updates typing usage and adds future-annotations import to align with new lint rules.
lambda/pyproject.toml	Expands ruff rule selection and enforces future-annotations via ruff.lint.isort.required-imports.
lambda/get_remote_execution_archs.py	Adds future-annotations import to satisfy new lint configuration.
lambda/get_deployed_exe_version.py	Adds future-annotations import and modernizes Dict typing to dict.
lambda/cloudwatch_to_discord.py	Adds future-annotations import to satisfy new lint configuration.
lambda/cloudwatch_to_discord_test.py	Adds future-annotations import to satisfy new lint configuration.
lambda/alert_on_elb_instance.py	Adds future-annotations import to satisfy new lint configuration.
lambda/alert_on_elb_instance_test.py	Adds future-annotations import to satisfy new lint configuration.
.github/workflows/python-tests.yaml	Adds a CI step to build both Lambda ZIP packages to catch packaging issues in PRs.

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