refactor: add impl methods for abstract bases

[giubacc]

Summary

• Refactor ABCs to delegate public methods to *_impl abstract methods.
• Update Docker Compose env/service and factories/completion managers accordingly.
• Add start_impl hook to Environment and adjust defaults.

Testing

• pytest
• pre-commit run --all-files
• black -v src
• isort src

Fixes #150

[codecov]

Codecov Report

❌ Patch coverage is 92.47312% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/environment/environment.py	83.78%	6 Missing ⚠️
src/service/service.py	96.55%	1 Missing ⚠️

Flag	Coverage Δ
unittests	86.96% <92.47%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/completion/completion.py	92.98% <100.00%> (ø)
src/completion/completion_env.py	87.34% <100.00%> (ø)
src/completion/completion_mng.py	72.72% <100.00%> (+6.06%)	⬆️
src/completion/completion_probe.py	74.28% <100.00%> (ø)
src/completion/completion_svc.py	85.83% <100.00%> (ø)
src/docker/docker_compose_env.py	90.00% <100.00%> (-0.10%)	⬇️
src/docker/docker_compose_svc.py	85.59% <100.00%> (ø)
src/factory/shpd_env_factory.py	83.33% <100.00%> (ø)
src/factory/shpd_svc_factory.py	94.73% <100.00%> (+0.29%)	⬆️
src/service/service.py	88.03% <96.55%> (+1.43%)	⬆️
... and 1 more

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[giubacc]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Hooray!

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[feed3r]

LGTM