refactor: remove pgvector runtime

harness/tht/migrations/vector/001_extensions.sql

@@ -1,3 +0,0 @@
-CREATE SCHEMA IF NOT EXISTS vectors;
-REVOKE ALL ON SCHEMA vectors FROM PUBLIC;
-CREATE EXTENSION IF NOT EXISTS vector WITH SCHEMA vectors;

harness/tht/migrations/vector/002_schema_tables.sql

@@ -1,32 +0,0 @@
-CREATE TABLE IF NOT EXISTS vectors.schema_records (
-    id bigserial PRIMARY KEY,
-    record_key text UNIQUE NOT NULL,
-    kind text NOT NULL,
-    content_hash text NOT NULL,
-    metadata jsonb NOT NULL,
-    embedding vectors.vector(768) NOT NULL,
-    indexed_at timestamptz NOT NULL DEFAULT pg_catalog.now()
-);
-
-CREATE TABLE IF NOT EXISTS vectors.evidence (
-    id bigserial PRIMARY KEY,
-    record_key text UNIQUE NOT NULL,
-    kind text NOT NULL,
-    content_hash text NOT NULL,
-    metadata jsonb NOT NULL,
-    embedding vectors.vector(768) NOT NULL,
-    indexed_at timestamptz NOT NULL DEFAULT pg_catalog.now()
-);
-
-CREATE TABLE IF NOT EXISTS vectors.memory (
-    id bigserial PRIMARY KEY,
-    record_key text UNIQUE NOT NULL,
-    kind text NOT NULL,
-    content_hash text NOT NULL,
-    metadata jsonb NOT NULL,
-    embedding vectors.vector(768) NOT NULL,
-    indexed_at timestamptz NOT NULL DEFAULT pg_catalog.now()
-);
-
-REVOKE ALL ON ALL TABLES IN SCHEMA vectors FROM PUBLIC;
-REVOKE ALL ON ALL SEQUENCES IN SCHEMA vectors FROM PUBLIC;

harness/tht/migrations/vector/003_roles.sql

@@ -1,23 +0,0 @@
-DO $roles$
-BEGIN
-    IF NOT EXISTS (SELECT 1 FROM pg_catalog.pg_roles WHERE rolname = 'vector_reader') THEN
-        CREATE ROLE vector_reader NOLOGIN;
-    END IF;
-    IF NOT EXISTS (SELECT 1 FROM pg_catalog.pg_roles WHERE rolname = 'vector_writer') THEN
-        CREATE ROLE vector_writer NOLOGIN;
-    END IF;
-END
-$roles$;
-
-REVOKE ALL ON SCHEMA vectors FROM vector_reader, vector_writer;
-REVOKE ALL ON ALL TABLES IN SCHEMA vectors FROM vector_reader, vector_writer;
-REVOKE ALL ON ALL SEQUENCES IN SCHEMA vectors FROM vector_reader, vector_writer;
-
-GRANT USAGE ON SCHEMA vectors TO vector_reader, vector_writer;
-GRANT SELECT ON ALL TABLES IN SCHEMA vectors TO vector_reader;
-
-GRANT INSERT, UPDATE
-ON vectors.schema_records, vectors.evidence, vectors.memory TO vector_writer;
-GRANT SELECT (record_key, kind, content_hash)
-ON vectors.schema_records, vectors.evidence, vectors.memory TO vector_writer;
-GRANT USAGE ON ALL SEQUENCES IN SCHEMA vectors TO vector_writer;

harness/tht/migrations/vector/004_evidence_generation_gc.sql

@@ -1,3 +0,0 @@
--- The writer owns derived-generation reconciliation but not runtime similarity reads.
-GRANT SELECT (metadata) ON vectors.evidence TO vector_writer;
-GRANT DELETE ON vectors.evidence TO vector_writer;