docs(issues): record issue 1419 partial delivery

[josecelano]

Summary

Records PR #2189 as the merged partial fixture-isolation delivery for issue #1419 and corrects the issue lifecycle after it was reopened.

Updates

• Sets related-pr: 2189.
• Marks the partial-improvement PR completion step done.
• Records that PR test(integration): [#1419] use explicit config path fixtures #2189 resolved only base-source environment mutation in the shared fixture.
• Records the accidental GitHub closure and reopening.
• Keeps the issue open with the Overhaul: Tracker Shutdown #1488-dependent cooperative-shutdown review and final closure review still pending.

Validation

• linter markdown
• linter cspell
• linter lychee
• git diff --check
• required pre-commit gate

Related to #1419

[Copilot]

Warning

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Pull request overview

Updates the documentation record for issue #1419 to reflect the merged partial delivery in PR #2189 and the subsequent issue reopening, keeping remaining work tracked.

Changes:

• Set related-pr: 2189 and updated last-updated-utc.
• Marked the partial-improvement PR completion step as done and recorded what PR #2189 did/didn’t resolve.
• Added timeline entries noting the merge and the accidental closure/reopen event.

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