Adopt the partitioner's tables at install, and test the reaper's epoch rule

[vyruss]

• CREATE EXTENSION coldfront on a database the standalone partitioner already set up adopts the coldfront.partition_config it created (and an archive_watermark an archiver run left), rows included, instead of failing on a table it does not own. A unit test pins the two Go copies of that DDL to the extension's.
• TC-191 covers the one reaper rule nothing exercised: a same-node claim whose ticket predates the postmaster is removed even while another session holds its table's lock.

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📝 Walkthrough

Walkthrough

The extension adopts existing partition_config and archive_watermark tables when they are not already extension members. Go table definitions are checked against the extension DDL. CI stories cover table adoption and stale-claim cleanup under a held lock.

Changes

Existing Partitioner Adoption

Layer / File(s)	Summary
Table DDL parity internal/partcfg/partcfg.go, internal/watermark/watermark.go, internal/partcfg/mirror_test.go	The Go table-creation SQL is available through exported constants. A test compares both definitions with the extension script DDL.
Extension adoption and verification extension/coldfront/coldfront--1.0.sql, ci/journey.sh, docs/changelog.md, docs/usage.md	The install script adds existing, unowned archive_watermark and partition_config tables to the extension. The stock-PostgreSQL story checks that existing partitioner registrations remain. The docs describe adoption of partition_config and its registrations.

Stale Claim Reaper Coverage

Layer / File(s)	Summary
Stale claim with a held lock ci/journey.sh	The mesh reaper story checks that a cold write succeeds and removes a stale claim for another table while that table’s advisory lock is held.

Priority: ⬇️ Low

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

Change: Bug fix

Suggested reviewers: imtiazqa

Merge Risk: ⚪ Minimal · up to fc7d6

The stale-claim test now verifies that the table remains locked across the write. No actionable merge-blocking risk remains after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes both primary changes: adopting existing partitioner tables during extension installation and testing the reaper's epoch rule.
Description check	✅ Passed	The description directly explains the table-adoption behavior, DDL consistency test, and TC-191 reaper test.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 4 files.
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.

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@ci/journey.sh`:
- Line 2391: Update the TC-191 lock check in the test to use a separate q
session to verify the stale table’s advisory lock is held immediately before the
write and remains held after it returns. Remove the timestamp-based w_end
assertion and keep wait "$holder" after the post-write check.

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📥 Commits

Reviewing files that changed from the base of the PR and between cbfe2a9 and 77e03f8.

📒 Files selected for processing (7)

• ci/journey.sh
• docs/changelog.md
• docs/usage.md
• extension/coldfront/coldfront--1.0.sql
• internal/partcfg/mirror_test.go
• internal/partcfg/partcfg.go
• internal/watermark/watermark.go

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