fix: derive CWD in duckdb-extensions common.sh so direct sourcing works

[maqeel75]

Summary

common.sh now derives CWD from its own BASH_SOURCE location when the caller hasn't set it.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: 6c294a4b-980f-44d1-b64d-89edb55c6224

📥 Commits

Reviewing files that changed from the base of the PR and between 32a7af7 and 3943b6b.

📒 Files selected for processing (1)

• packaging/coldfront-duckdb-extensions/common.sh

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📝 Walkthrough

Walkthrough

Changes

CWD initialization

Layer / File(s)	Summary
Add CWD fallback initialization packaging/coldfront-duckdb-extensions/common.sh	common.sh derives CWD from its own location when CWD is unset. Existing CWD values remain unchanged.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: vyruss

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: deriving CWD in common.sh to support direct sourcing.
Description check	✅ Passed	The description accurately explains that common.sh derives CWD from BASH_SOURCE when the caller has not set it.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch fix/current-working-directory-issue

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[codacy-production]

Up to standards ✅

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