feat: add architecture docs, fix code issues from review, add analyze_lint script

Architecture docs (docs/architecture/):
- overview.md: package purpose, exports, terminology, design decisions, gaps
- metagraph.md: core graph model, schema types, SchemaBuilder, validation
- sqlite-host.md: SQLite tables, common columns, relations, concurrency model
- encrypted-data.md: encrypted data as a node type, AES-256-GCM crypto utility design

Code fixes from architecture review:
- Remove ConfigSchema duplication in graphTypes.ts (import GraphConfig from types.ts)
- Add missing SelectNodeSchema/SelectNode to nodes.ts
- Fix InsertEdge.key to be Optional (match nullable DB column)
- Replace TypeScript enums with as const objects (GRAPH_STATUS, GRAPH_BASE_TYPE)
- Add verbatim-module-syntax to lint exclusions (TypeBox false positive)
- Add @std/flags and @std/path to deno.json imports

Infrastructure:
- Add scripts/analyze_lint.ts from @ade for grouped lint analysis
- Add deno task lint:analyze
- Update AGENTS.md with architecture doc references, enum convention, crypto todo

src/sqlite/tables/graphs.ts

@@ -3,7 +3,7 @@ import { createInsertSchema, createSelectSchema } from "@alkdev/drizzlebox";
 import { Type, type Static } from "@alkdev/typebox";
 import { commonCols } from "./common.ts";
 import { graphTypes } from "./graphTypes.ts";
-import { EnumGraphStatus } from "../../graphs/types.ts";
+import { GRAPH_STATUS } from "../../graphs/types.ts";
 
 export const graphs = sqliteTable("graphs", {
   ...commonCols,
@@ -26,9 +26,9 @@ export type SelectGraph = Static<typeof SelectGraph>;
 export const InsertGraph = createInsertSchema(graphs, {
   name: Type.String({ minLength: 2 }),
   status: Type.Optional(Type.Union([
-    Type.Literal(EnumGraphStatus.Active),
-    Type.Literal(EnumGraphStatus.Archived),
-    Type.Literal(EnumGraphStatus.Draft),
+    Type.Literal(GRAPH_STATUS.Active),
+    Type.Literal(GRAPH_STATUS.Archived),
+    Type.Literal(GRAPH_STATUS.Draft),
   ])),
 });