Release v0.2.6

[pinodeca]

Tracking issue for the v0.2.6 release. Procedure: prompts/pg_durable-release.md.

Cut line (PRs in this release): #318 through changelog PR #351, merged at 6799781; later PRs defer to v0.2.7.
Tag commit: 6799781da58c7f51b9046445759362d2301610dd
Published by: Pino de Candia (@pinodeca)

• Cut line confirmed
• Changelog merged (PR #351)
• Version/upgrade-script sanity
• CI green on tag commit (6799781, run #32668610557)
• Tagged v0.2.6 → draft Release (run #32669821952, draft release)
• Release published (approved by: Pino de Candia (@pinodeca))
• GHCR images confirmed (run #32678828382)
• PGXN release confirmed - see https://pgxn.org/dist/pg_durable
• Next-cycle PR opened (#352)