refactor: extract seed provision scripts to dedicated directory

Move bootstrap, default, and inform scripts from inline template
strings in lib/init.ts to standalone files under seed/, loaded via
an esbuild text-loader plugin. Add type-checking (provisions.d.ts,
tsconfig.json) and ESLint config for the seed scripts. Set tsconfig
module to Preserve to support import attributes.

seed/provisions.d.ts

@@ -0,0 +1,71 @@
+interface Timestamps {
+  path?: number;
+  object?: number;
+  writable?: number;
+  value?: number;
+  notification?: number;
+  accessList?: number;
+}
+
+interface Values {
+  path?: number | [number, number];
+  object?: boolean;
+  writable?: boolean;
+  value?: string | number | boolean | [string | number | boolean, string?];
+  notification?: number;
+  accessList?: string[];
+}
+
+interface ParameterWrapper extends Iterable<ParameterWrapper> {
+  readonly path: string | undefined;
+  readonly size: number | undefined;
+  readonly object: 0 | 1 | undefined;
+  readonly writable: 0 | 1 | undefined;
+  readonly value: [string | number | boolean, string] | undefined;
+  readonly notification: number | undefined;
+  readonly accessList: string[] | undefined;
+}
+
+declare function declare(
+  path: string,
+  timestamps?: Timestamps | null,
+  values?: Values | null,
+): ParameterWrapper;
+
+declare function clear(
+  path: string,
+  timestamp: number,
+  attributes?: Timestamps,
+): void;
+
+declare function commit(): void;
+
+declare function ext(...args: unknown[]): unknown;
+
+declare function log(msg: string, meta?: Record<string, unknown>): void;
+
+declare const args: unknown[];
+
+interface DateConstructor {
+  new (): Date;
+  new (
+    year: number,
+    monthIndex?: number,
+    day?: number,
+    hours?: number,
+    minutes?: number,
+    seconds?: number,
+    milliseconds?: number,
+  ): Date;
+  now(intervalOrCron?: number | string, variance?: number): number;
+  parse(dateString: string): number;
+  UTC(
+    year: number,
+    monthIndex?: number,
+    day?: number,
+    hours?: number,
+    minutes?: number,
+    seconds?: number,
+    milliseconds?: number,
+  ): number;
+}