v0.3.1

Changelog

• 7970738 ci(release): post-release smoke — image is public + signature verifies
• ed30d8d collect: report the server's config and real client load, not pgbot's own (PR#1)
• 006fad7 collect: side-effect + accuracy fixes to the read path (PR#1)
• 0996787 docs(changelog): cut 0.3.1 — PR#1 self-observation fixes + npm live
• 23e8b1d docs(readme): docker -e DATABASE_URL form + multi-arch/public note
• 67b810f docs(readme): docker run against a remote/managed DB, the secure way
• 51f0a74 docs(readme): show $DATABASE_URL env-var usage in the top quickstart
• 7df26c7 findings/vacuum/render: signal-quality fixes (PR#1)
• a7fab94 test(collect): self-observation gates in the full-pipeline integration test (PR#1)