Rename fullTextSearch composite filter to unifiedSearch in skills docs

[pyramation]

Summary

Renames all references to the composite GraphQL filter field from fullTextSearch to unifiedSearch across the skills documentation. This disambiguates the composite multi-algorithm filter (which fans out to tsvector + BM25 + trgm simultaneously) from the tsvector-specific fullTextSearchTsv per-adapter filter.

Companion to constructive-io/constructive#956 which renames the actual plugin code, codegen, and tests.

What changed (13 files):

• graphile-search/SKILL.md — field name, config option (enableFullTextSearch → enableUnifiedSearch), description
• graphile-search/references/ — adapter flag descriptions (supportsTextSearch comment), codegen SDK query examples, adapter interface JSDoc
• constructive-graphql/SKILL.md — quick start examples, search strategy table, reference table
• constructive-graphql/references/ — search-composite, search-trigram, search-postgis, search-rag
• constructive-ai/references/rag-pipeline.md — hybrid search example

What was intentionally left unchanged:

• fullTextSearchTsv (tsvector adapter filter field name)
• db.fullTextSearch.create() / .update() / .delete() / .findMany() (metaschema table ORM operations in search-tsvector.md)
• filterPrefix: 'fullText' (tsvector adapter config)
• fullTextScalarName (GraphQL scalar config)

Review & Testing Checklist for Human

• Verify no composite fullTextSearch references were missed: Run grep -r 'fullTextSearch' .agents/skills/ | grep -v 'fullTextSearchTsv' | grep -v 'db\.fullTextSearch' | grep -v 'fullTextSearch\.create' | grep -v 'fullTextSearch\.update' | grep -v 'fullTextSearch\.delete' | grep -v 'fullTextSearch\.findMany' | grep -v 'filterPrefix' | grep -v 'fullTextScalarName' | grep -v 'fullTextBodyTsv' — should return zero results
• Verify no tsvector/metaschema references were accidentally renamed: Spot-check search-tsvector.md — all db.fullTextSearch.* ORM calls and fullTextSearchTsv filter usages should remain unchanged
• Merge after constructive#956: This PR should land after (or simultaneously with) the code PR to avoid docs referencing a field name that doesn't exist yet

Notes

• This is a docs-only change — no code, no tests, no runtime impact.
• Minor cosmetic: enableUnifiedSearch: true, in graphile-search/SKILL.md line 79 has slightly different trailing whitespace alignment than the surrounding config lines. Non-functional.

Link to Devin session: https://app.devin.ai/sessions/e35003b7898c437e8d69a0c70b6020f2
Requested by: @pyramation

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