feat: migracion SQL, template DB y generador para fn_operations

001_init.sql como espejo del schema, gentemplate para crear operations.db
vacias con schema aplicado, y template lista para copiar con fn ops init.

fn_operations/cmd/gentemplate/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	ops "fn-registry/fn_operations"
+)
+
+func main() {
+	path := "fn_operations/project_template/operations.db"
+	if len(os.Args) > 1 {
+		path = os.Args[1]
+	}
+
+	// Remove existing template
+	os.Remove(path)
+
+	db, err := ops.Open(path)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+	defer db.Close()
+
+	fmt.Printf("Template DB created at %s\n", path)
+}

fn_operations/migrations/001_init.sql

@@ -0,0 +1,80 @@
+-- fn_operations schema v1.0.0
+-- Espejo del schema en fn_operations/db.go para referencia y tooling externo.
+
+PRAGMA journal_mode=WAL;
+PRAGMA foreign_keys=ON;
+
+CREATE TABLE IF NOT EXISTS types_snapshot (
+	id          TEXT PRIMARY KEY,
+	version     TEXT NOT NULL DEFAULT '1.0.0',
+	lang        TEXT NOT NULL,
+	algebraic   TEXT NOT NULL CHECK(algebraic IN ('product','sum')),
+	definition  TEXT NOT NULL DEFAULT '',
+	description TEXT NOT NULL DEFAULT '',
+	snapped_at  TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS entities (
+	id          TEXT PRIMARY KEY,
+	name        TEXT NOT NULL,
+	type_ref    TEXT NOT NULL,
+	status      TEXT NOT NULL DEFAULT 'active' CHECK(status IN ('active','stale','corrupted','archived')),
+	description TEXT NOT NULL DEFAULT '',
+	domain      TEXT NOT NULL DEFAULT '',
+	tags        TEXT NOT NULL DEFAULT '[]',
+	source      TEXT NOT NULL,
+	metadata    TEXT NOT NULL DEFAULT '{}',
+	notes       TEXT NOT NULL DEFAULT '',
+	created_at  TEXT NOT NULL,
+	updated_at  TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS relations (
+	id          TEXT PRIMARY KEY,
+	name        TEXT NOT NULL,
+	from_entity TEXT NOT NULL DEFAULT '',
+	to_entity   TEXT NOT NULL,
+	via         TEXT NOT NULL DEFAULT '',
+	description TEXT NOT NULL DEFAULT '',
+	purity      TEXT NOT NULL DEFAULT '' CHECK(purity IN ('','pure','impure')),
+	direction   TEXT NOT NULL DEFAULT 'unidirectional' CHECK(direction IN ('unidirectional','bidirectional','inverse')),
+	weight      REAL,
+	status      TEXT NOT NULL DEFAULT 'designed' CHECK(status IN ('designed','implemented','tested','running','deprecated')),
+	started_at  TEXT,
+	ended_at    TEXT,
+	"order"     INTEGER,
+	tags        TEXT NOT NULL DEFAULT '[]',
+	notes       TEXT NOT NULL DEFAULT '',
+	created_at  TEXT NOT NULL,
+	updated_at  TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS relation_inputs (
+	id          TEXT PRIMARY KEY,
+	relation_id TEXT NOT NULL REFERENCES relations(id) ON DELETE CASCADE,
+	entity_id   TEXT NOT NULL REFERENCES entities(id),
+	role        TEXT NOT NULL,
+	"order"     INTEGER
+);
+
+CREATE VIRTUAL TABLE IF NOT EXISTS entities_fts USING fts5(
+	id, name, description, tags, domain,
+	content='entities', content_rowid='rowid'
+);
+
+CREATE TRIGGER IF NOT EXISTS entities_ai AFTER INSERT ON entities BEGIN
+	INSERT INTO entities_fts(rowid, id, name, description, tags, domain)
+	VALUES (new.rowid, new.id, new.name, new.description, new.tags, new.domain);
+END;
+
+CREATE TRIGGER IF NOT EXISTS entities_ad AFTER DELETE ON entities BEGIN
+	INSERT INTO entities_fts(entities_fts, rowid, id, name, description, tags, domain)
+	VALUES ('delete', old.rowid, old.id, old.name, old.description, old.tags, old.domain);
+END;
+
+CREATE TRIGGER IF NOT EXISTS entities_au AFTER UPDATE ON entities BEGIN
+	INSERT INTO entities_fts(entities_fts, rowid, id, name, description, tags, domain)
+	VALUES ('delete', old.rowid, old.id, old.name, old.description, old.tags, old.domain);
+	INSERT INTO entities_fts(rowid, id, name, description, tags, domain)
+	VALUES (new.rowid, new.id, new.name, new.description, new.tags, new.domain);
+END;