Add test/CLAUDE.md referencing ai/'s schema-testing conventions

[jnasbyupgrade]

This extension isn't pinned to a fixed schema (no schema= in its .control file, and its install SQL uses @extschema@ throughout), so Postgres-Extensions/ai's random-schema testing conventions (ai#5) apply here.

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[github-actions]

Claude finished @jnasbyupgrade's task in 1m 39s —— View job

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Code Review: Add test/CLAUDE.md

• Gather context (read PR diff, referenced conventions)
• Understand the request
• Review the change
• Post final review

Summary: This is a 5-line, doc-only PR that adds test/CLAUDE.md, pointing readers to ../../ai/test/CLAUDE.md (schema/search_path-isolation principle) and ../../ai/RANDOM_SCHEMA_TESTING.md (random-schema testing conventions) in the sibling Postgres-Extensions/ai repo.

Verified against this repo:

• ✅ count_nulls.control has no schema= line — confirmed.
• ✅ Install scripts (sql/count_nulls.sql, sql/count_nulls--1.0.0.sql, sql/count_nulls--stable.sql) each use @extschema@ 4 times — confirmed. So the stated rationale for applying the random-schema testing conventions holds.
• ✅ Relative path math is correct: from test/CLAUDE.md, ../../ai/... resolves to the same location as ../ai/... from the root CLAUDE.md (one extra ../ to account for being one directory deeper).
• ✅ Style/wrapping is consistent with the existing root CLAUDE.md.

Minor observation (non-blocking): The root CLAUDE.md includes a fallback (the GitHub URL + "clone it to ../ai/ per its own first instruction") for when the ../ai/ path doesn't exist locally. The new test/CLAUDE.md doesn't repeat that fallback, but since it's colocated with the root file which already establishes the clone convention, this is a reasonable omission to avoid redundancy — not a real issue.

Not verified: I don't have network/API access in this session, so I could not confirm that test/CLAUDE.md and RANDOM_SCHEMA_TESTING.md actually exist at those paths in Postgres-Extensions/ai, or that issue ai#5 matches the description in the PR body. Given the author's context and the accurate description of this repo's @extschema@/schema-less setup, I have no reason to doubt it, but a maintainer familiar with the ai repo should give it a quick sanity check.

Verdict: LGTM — low-risk, accurate, and consistent documentation addition.