feat: tablas unit_tests y e2e_tests

Migración 008 en registry.db para unit_tests con FTS5 (tests individuales extraídos de archivos de test). Migración 004 en operations.db para e2e_tests con FTS5 (tests de integración entre funciones dentro de apps).

registry/migrations/008_unit_tests.sql

@@ -0,0 +1,37 @@
+-- unit_tests: individual test cases extracted from test files
+CREATE TABLE unit_tests (
+    id           TEXT PRIMARY KEY,
+    function_id  TEXT NOT NULL REFERENCES functions(id) ON DELETE CASCADE,
+    name         TEXT NOT NULL,
+    code         TEXT NOT NULL DEFAULT '',
+    file_path    TEXT NOT NULL DEFAULT '',
+    lang         TEXT NOT NULL,
+    created_at   TEXT NOT NULL,
+    updated_at   TEXT NOT NULL
+);
+
+CREATE INDEX idx_unit_tests_function ON unit_tests(function_id);
+CREATE INDEX idx_unit_tests_lang ON unit_tests(lang);
+
+CREATE VIRTUAL TABLE unit_tests_fts USING fts5(
+    id, name, code, function_id, lang,
+    content='unit_tests',
+    content_rowid='rowid'
+);
+
+CREATE TRIGGER unit_tests_ai AFTER INSERT ON unit_tests BEGIN
+    INSERT INTO unit_tests_fts(rowid, id, name, code, function_id, lang)
+    VALUES (new.rowid, new.id, new.name, new.code, new.function_id, new.lang);
+END;
+
+CREATE TRIGGER unit_tests_ad AFTER DELETE ON unit_tests BEGIN
+    INSERT INTO unit_tests_fts(unit_tests_fts, rowid, id, name, code, function_id, lang)
+    VALUES ('delete', old.rowid, old.id, old.name, old.code, old.function_id, old.lang);
+END;
+
+CREATE TRIGGER unit_tests_au AFTER UPDATE ON unit_tests BEGIN
+    INSERT INTO unit_tests_fts(unit_tests_fts, rowid, id, name, code, function_id, lang)
+    VALUES ('delete', old.rowid, old.id, old.name, old.code, old.function_id, old.lang);
+    INSERT INTO unit_tests_fts(rowid, id, name, code, function_id, lang)
+    VALUES (new.rowid, new.id, new.name, new.code, new.function_id, new.lang);
+END;