test: add archiver crash rollback and partitioner FK drop rollback journey stories

[imtiazqa]

Adds two journey stories covering rollback behavior:

Archiver crash rollback — kills the archiver mid Phase 2, asserts data stays in PG, verifies Phase 0 self-heals on re-run
Partitioner FK drop rollback — inbound FK blocks expired partition drop, asserts fail-fast with SQLSTATE 23503 (no retry loop), self-heals after FK reference removed. Skipped in mesh mode with a NOTE.

[coderabbitai]

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ℹ️ Recent review info

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Review profile: CHILL

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Run ID: 114eb2b9-5812-4398-8d80-db6a34f016b2

📥 Commits

Reviewing files that changed from the base of the PR and between f74749f and 4507e07.

📒 Files selected for processing (1)

• ci/journey.sh

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📝 Walkthrough

Walkthrough

This PR adds two new tiered E2E test stories to ci/journey.sh: story_archiver_rollback, which validates archiver crash recovery and self-healing, and story_partitioner_fk_drop, which validates partitioner failure and self-healing around FK-referenced expired partitions. Both are wired into the tiered execution path.

Changes

Journey script E2E stories

Layer / File(s)	Summary
Archiver crash and self-heal story ci/journey.sh	New story_archiver_rollback function starts the archiver with a debug export delay, kills it mid-run, confirms the row survives in PostgreSQL, then re-runs the archiver and asserts watermark write and unified-view row visibility.
Partitioner FK-drop guard story and wiring ci/journey.sh	New story_partitioner_fk_drop function verifies the partitioner fails with SQLSTATE 23503 when an FK references an expired partition, then self-heals once the FK row is removed; both new stories are inserted into the tiered orchestration before story_register_cli.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Suggested reviewers: vyruss

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding archiver crash rollback and partitioner FK drop rollback journey stories.
Description check	✅ Passed	The description directly matches the changeset by describing both rollback journey stories and their expected behavior.
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

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/rollback-automation

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[codacy-production]

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