fix: metrics appear when launching with the CLI

[fvaleye]

Description

The metrics are displayed when launching before timing expiration with the CLI.

Related Issue(s)

• closes Nothing happend upon running Tracarbon CLI #422

[Copilot]

Pull Request Overview

This PR ensures metrics are only displayed after their timing window expires when using the CLI and hardens error handling, while also updating project configuration and tooling.

• Add skip logic and structured error handling around metric generation in the stdout exporter
• Enhance CLI’s run_metrics with initialization guards and top-level exception handling
• Migrate project metadata to PEP 621 format and bump tooling versions (Makefile & pre-commit)

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tracarbon/exporters/stdout.py	Wraps metric loop in try/except, logs and skips None values, adds debug/error logging
tracarbon/cli/init.py	Initializes tracarbon before try, catches general exceptions, differentiates exit log paths
pyproject.toml	Replaces [tool.poetry] with PEP 621 [project], restructures author/dev dependency formats
Makefile	Changes poetry install target to poetry install --with dev
.pre-commit-config.yaml	Updates Poetry plugin rev from 1.5.1 to 2.1.3

Comments suppressed due to low confidence (5)

tracarbon/exporters/stdout.py:24

• Added logic to skip metrics with None value but there are no tests covering this scenario; consider adding a unit test to verify that metrics with None values are properly skipped and that the corresponding debug log is emitted.

if metric_value is not None:

tracarbon/exporters/stdout.py:31

• [nitpick] Using logger.error here omits the stack trace; consider using logger.exception to include full exception context for easier debugging.

except Exception as e:

tracarbon/cli/init.py:124

• [nitpick] The CLI logs initialization errors but still exits with a zero status code; consider calling sys.exit(1) after logging to signal failure to upstream processes.

except Exception as e:

pyproject.toml:1

• Migrating from Poetry’s [tool.poetry] to PEP 621 [project] may break existing Poetry workflows; ensure the [build-system] section is updated accordingly and that your CI/tooling supports the PEP 621 layout.

[project]

Makefile:6

• [nitpick] Using --with dev ensures development dependencies are installed but may exclude other optional groups; verify this aligns with the expected setup and update the README accordingly.

@poetry install --with dev