Bump pgvector/pgvector from 0.8.5-pg15 to 0.8.6-pg15 in /compose/production/postgres

[dependabot]

Bumps pgvector/pgvector from 0.8.5-pg15 to 0.8.6-pg15.

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[claude]

Review

This is a routine Dependabot bump of the pgvector/pgvector base image from 0.8.5-pg15 to 0.8.6-pg15 in compose/production/postgres/Dockerfile. The change is a single line with no logic, application code, or test changes involved.

Assessment:

• Correctness: Straightforward tag bump; no other lines touched.
• Compatibility: 0.8.6 is a patch release on the same pgvector minor line (0.8.x) and pg15 major version, so no schema/extension migration should be needed beyond what's already handled by migration 0063 / init.sql for fresh vs. existing databases (per the comment retained in the file).
• Risk: Low. Recommend checking the pgvector 0.8.6 release notes for any bug fixes affecting HNSW iterative scan behavior, since this repo explicitly configures HNSW iterative scan settings — worth a quick sanity check that no defaults changed.
• Test coverage: N/A for a base image bump; existing CI/integration tests exercising pgvector-backed embedding/search functionality should be sufficient to catch regressions.

No blocking concerns. Safe to merge pending green CI.