chore(8.0): modernize toolchain + position Bun as a runtime

Consumer-invisible modernization pass — no public API or runtime-behavior
change; dist for the override-only files is byte-identical.

Toolchain:
- CI: GitHub Actions matrix — Node 22/24 (test:unit) + Bun latest (test:bun).
- engines: node ">=22" (was "22.x"), bun ">=1.1.0".
- tsconfig: isolatedModules + noImplicitOverride; add the 33 `override`
  modifiers the flag requires across storage/integrations/vfs/transaction.
- deps: @types/node ^22; add prettier; drop dead standard-version,
  @rollup/plugin-* and the redundant embedded eslintConfig (flat
  eslint.config.js is the active config — verified identical lint output).

paramValidation: replace the top-level `await import('node:os'/'node:fs')`
with static ESM imports. The top-level-await form poisoned the module graph;
static imports also drop the browser/edge fallback branches no supported
runtime reaches (8.0 is Node/Bun/Deno-only).

Bun positioning: recommend Bun as a runtime (`bun add` / `bun run`), which is
green (test:bun 8/8). Drop single-binary `bun build --compile` as a target —
native addons cannot embed into it, and Bun 1.3.10 has a `--compile` codegen
regression around top-level await. Rename the Bun test to bun-runtime-test.ts
and correct docs that overclaimed single-binary support.

Gates: typecheck 0, build 0, test:unit 1743/1743, test:bun 8/8.

src/storage/baseStorage.ts

@@ -1551,7 +1551,7 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    * - Early termination when offset + limit entities collected
    * - Memory efficient: Never loads full dataset
    */
-  public async getNounsWithPagination(options: {
+  public override async getNounsWithPagination(options: {
     limit: number
     offset: number
     cursor?: string  // Opaque resume token from a prior page's nextCursor; when set it supersedes offset (O(N) walk, no re-scan)
@@ -1717,7 +1717,7 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    * - Memory efficient: Never loads full dataset
    * - Inline filtering for sourceId, targetId, verbType
    */
-  public async getVerbsWithPagination(options: {
+  public override async getVerbsWithPagination(options: {
     limit: number
     offset: number
     cursor?: string  // Opaque resume token from a prior page's nextCursor; when set it supersedes offset (O(N) walk, no re-scan)
@@ -2442,13 +2442,13 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    * Clear all data from storage
    * This method should be implemented by each specific adapter
    */
-  public abstract clear(): Promise<void>
+  public abstract override clear(): Promise<void>
 
   /**
    * Get information about storage usage and capacity
    * This method should be implemented by each specific adapter
    */
-  public abstract getStorageStatus(): Promise<{
+  public abstract override getStorageStatus(): Promise<{
     type: string
     used: number
     quota: number | null
@@ -2957,7 +2957,7 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    *
    * @public - Inherited from BaseStorageAdapter
    */
-  public getBatchConfig(): StorageBatchConfig {
+  public override getBatchConfig(): StorageBatchConfig {
     // Conservative defaults - adapters should override with their actual limits
     return {
       maxBatchSize: 100,
@@ -3513,7 +3513,7 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    * writer flush — the same silent-stale failure mode that once produced
    * zero counts from `brain.stats()`.
    */
-  public async flushCounts(): Promise<void> {
+  public override async flushCounts(): Promise<void> {
     await super.flushCounts()
     await this.saveTypeStatistics()
     await this.saveSubtypeStatistics()
@@ -4297,7 +4297,7 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    * Save statistics data to storage (public interface)
    * @param statistics The statistics data to save
    */
-  public async saveStatistics(statistics: StatisticsData): Promise<void> {
+  public override async saveStatistics(statistics: StatisticsData): Promise<void> {
     return this.saveStatisticsData(statistics)
   }
 
@@ -4305,7 +4305,7 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    * Get statistics data from storage (public interface)
    * @returns Promise that resolves to the statistics data or null if not found
    */
-  public async getStatistics(): Promise<StatisticsData | null> {
+  public override async getStatistics(): Promise<StatisticsData | null> {
     return this.getStatisticsData()
   }
 
@@ -4314,7 +4314,7 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    * This method should be implemented by each specific adapter
    * @param statistics The statistics data to save
    */
-  protected abstract saveStatisticsData(
+  protected abstract override saveStatisticsData(
     statistics: StatisticsData
   ): Promise<void>
 
@@ -4323,5 +4323,5 @@ export abstract class BaseStorage extends BaseStorageAdapter {
    * This method should be implemented by each specific adapter
    * @returns Promise that resolves to the statistics data or null if not found
    */
-  protected abstract getStatisticsData(): Promise<StatisticsData | null>
+  protected abstract override getStatisticsData(): Promise<StatisticsData | null>
 }