fix: resolve package version from source tree metadata

[SSobol77]

Maintenance fix for source-tree version resolution after v0.2.0 preparation.

Scope:

• resolve ecli.version from pyproject.toml when running from a source checkout
• preserve installed-package fallback via importlib.metadata.version("ecli-editor")
• preserve local fallback "0.0.0+local"
• add tests for source-tree, installed-package, malformed pyproject, missing metadata, non-string version, and fallback behavior

Why:

• local source-tree execution must report the same version as pyproject.toml
• tests must not accidentally depend on stale installed package metadata from .venv/site-packages

Not included:

• no pyproject.toml version change
• no release tag rewrite
• no release workflow change
• no CLI/TUI behavior change
• no package artifacts

Validation:

• PYTHONPATH=src python3 -m pytest tests/test_smoke.py -v
• PYTHONPATH=src python3 -m pytest tests/test_version_resolution.py -v
• PYTHONPATH=src python3 -m pytest tests/services -v
• PYTHONPATH=src python3 -m pytest tests/characterization -v
• PYTHONPATH=src python3 -m pytest tests/ui -v
• PYTHONPATH=src python3 -m pytest tests/cli -v
• PYTHONPATH=src python3 -m compileall src
• ruff check src tests
• ruff format --check src tests
• ./scripts/check-log-invariant.sh
• git diff --check

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud