fix: reconcile merged-PR XP across all installs and pages (#872)

[ionfwsrijan]

Problem

reconcileMergedPrXp capped work at 50 installs and 20 repos per install, and did not paginate closed PRs, so merged PRs in larger organizations were never XP-awarded and the recompute silently under-reported totals.

Fix

• Removed the install/repo caps; all active installs are scanned, every repo per install.
• Closed-PR queries are paginated (descending by updated) while the newest updated_at still falls inside the 7-day window, bounded by RECONCILE_MAX_PAGES=10.

Files changed

• src/inngest/functions/maintenance.ts
• Test: src/inngest/functions/maintenance.test.ts

Testing

• Full MergeShip suite passes.
• New pagination test asserts a page-2 merged PR is awarded XP.

Closes #872

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[github-actions]

Hey @ionfwsrijan

You have 4 open PRs right now. The limit is 3 at a time.

Please get your existing PRs merged or closed before opening new ones:

• fix: exact maintainer status check with negative-cache lockdown (#871) #876 - fix: exact maintainer status check with negative-cache lockdown ([BUG] isUserMaintainer truncates the grant check to 20 junction rows and caches the result for 1h — maintainers with many installs are wrongly locked out #871)
• fix: maintainer queue pagination with in-SQL filters and exact counts #868 - fix: maintainer queue pagination with in-SQL filters and exact counts
• fix: bound issues-sweep cost with per-repo checkpoints and cooldown  #865 - fix: bound issues-sweep cost with per-repo checkpoints and cooldown

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[ionfwsrijan]

@jakharmonika364 @Soumya-codr Please review this

[jakharmonika364]

lgtm, thanks!