Enable ruff DTZ rules

[bluetoothbot]

What does this implement/fix?

Enables the ruff DTZ (flake8-datetimez) rule family.

datetime.now() without a tz argument returns a naive local-time
value that silently drifts when serialized or compared against
tz-aware datetimes. DTZ catches this class of bug at lint time.

What changed

• aioesphomeapi/log_reader.py:64 switches datetime.now() to
  datetime.now().astimezone(). The result is an aware local
  datetime — .hour, .minute, .second, .microsecond values
  are unchanged, so the user-visible log prefix
  ([HH:MM:SS.mmm]) stays identical. Only DTZ violation in the
  repo.
• pyproject.toml adds "DTZ" to the [tool.ruff.lint] select
  list (alphabetical position, between B and E).

Follows the established cadence of one ruff family per PR
(PERF, PTH #1678, PT006/PT007 #1679, B #1683, PGH #1684).

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code quality improvements to existing code or addition of tests
• Other

Related issue or feature (if applicable):

• n/a

Pull request in esphome (if applicable):

• n/a

Checklist:

• The code change is tested and works locally.
• If api.proto was modified, a linked pull request has been made to esphome with the same changes. (api.proto not modified.)
• Tests have been added to verify that the new code works (under tests/ folder). (Existing tests/test_log_reader.py covers the timestamp callback path; no behavior change.)

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Quality Report

Changes: 2 files changed, 2 insertions(+), 1 deletion(-)

Code scan: clean

Tests: failed (FAILED)

Branch hygiene: clean

Generated by Kōan post-mission quality pipeline

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dcd9453) to head (f6f9a2b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1694   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines         4165      4165           
=========================================
  Hits          4165      4165           

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[codspeed-hq]

Merging this PR will not alter performance

✅ 47 untouched benchmarks

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_{Comparing bluetoothbot:koan/enable-ruff-dtz (f6f9a2b) with main (dcd9453)}

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b9522ee2-469d-4bf1-ac78-f56c76c54bdd

📥 Commits

Reviewing files that changed from the base of the PR and between dcd9453 and f6f9a2b.

📒 Files selected for processing (2)

• aioesphomeapi/log_reader.py
• pyproject.toml

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Walkthrough

This PR updates the log timestamp generation to use timezone-aware datetime and enables the DTZ linting rule to enforce timezone-aware datetime practices across the codebase. The log prefix timestamp now includes timezone information by calling datetime.now().astimezone().

Changes

Timezone-aware datetime enforcement

Layer / File(s)	Summary
Timezone-aware datetime and DTZ linting enforcement aioesphomeapi/log_reader.py, pyproject.toml	Log timestamp generation is updated from naive datetime.now() to timezone-aware datetime.now().astimezone(). The Ruff DTZ rule group (flake8-datetimez) is enabled to enforce timezone-aware datetime usage across the project.

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• esphome/aioesphomeapi#1683: Both PRs modify Ruff lint configuration in pyproject.toml, adding different rule groups to enforce code standards.
• esphome/aioesphomeapi#915: Both PRs update the Ruff lint configuration in pyproject.toml to add new rule sets for code quality enforcement.

Suggested reviewers

• bdraco

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Copilot]

Pull request overview

Enables Ruff’s DTZ (flake8-datetimez) lint rule family to prevent introducing naive local datetimes, and updates the log reader timestamp generation accordingly.

Changes:

• Add DTZ to [tool.ruff.lint].select in pyproject.toml.
• Update aioesphomeapi/log_reader.py to use a timezone-aware timestamp for log prefix formatting.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pyproject.toml	Enables Ruff DTZ rules in the lint selection list.
aioesphomeapi/log_reader.py	Adjusts log timestamp creation to be tz-aware for DTZ compliance.

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