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/adapters/fileSystemStorage.ts

@@ -164,7 +164,7 @@ export class FileSystemStorage extends BaseStorage {
    *
    * @returns FileSystem-optimized batch configuration
    */
-  public getBatchConfig(): StorageBatchConfig {
+  public override getBatchConfig(): StorageBatchConfig {
     return {
       maxBatchSize: 500,
       batchDelayMs: 0,
@@ -180,7 +180,7 @@ export class FileSystemStorage extends BaseStorage {
   /**
    * Initialize the storage adapter
    */
-  public async init(): Promise<void> {
+  public override async init(): Promise<void> {
     if (this.isInitialized) {
       return
     }
@@ -952,7 +952,7 @@ export class FileSystemStorage extends BaseStorage {
    *
    * @param prefix - Storage-root-relative directory prefix to remove.
    */
-  public async removeRawPrefix(prefix: string): Promise<void> {
+  public override async removeRawPrefix(prefix: string): Promise<void> {
     await this.ensureInitialized()
     await fs.promises.rm(path.join(this.rootDir, prefix), { recursive: true, force: true })
   }
@@ -966,7 +966,7 @@ export class FileSystemStorage extends BaseStorage {
    *
    * @param paths - Storage-root-relative object paths previously written.
    */
-  public async syncRawObjects(paths: string[]): Promise<void> {
+  public override async syncRawObjects(paths: string[]): Promise<void> {
     await this.ensureInitialized()
     const parentDirs = new Set<string>()
 
@@ -1539,7 +1539,7 @@ export class FileSystemStorage extends BaseStorage {
   // Removed 10 *_internal method overrides - now inherit from BaseStorage's type-first implementation
   // Removed 2 pagination methods (getNounsWithPagination, getVerbsWithPagination) - use BaseStorage's implementation
 
-  public supportsMultiProcessLocking(): boolean {
+  public override supportsMultiProcessLocking(): boolean {
     return true
   }
 
@@ -1557,7 +1557,7 @@ export class FileSystemStorage extends BaseStorage {
    *      `lastHeartbeat` is older than `WRITER_STALE_THRESHOLD_MS` (60s).
    * Stale locks are overwritten with a warning. `force: true` overrides even live locks.
    */
-  public async acquireWriterLock(options?: { force?: boolean }): Promise<WriterLockInfo | null> {
+  public override async acquireWriterLock(options?: { force?: boolean }): Promise<WriterLockInfo | null> {
     await this.ensureInitialized()
     await this.ensureDirectoryExists(this.lockDir)
 
@@ -1639,7 +1639,7 @@ export class FileSystemStorage extends BaseStorage {
     return info
   }
 
-  public async releaseWriterLock(): Promise<void> {
+  public override async releaseWriterLock(): Promise<void> {
     if (this.writerLockHeartbeat) {
       clearInterval(this.writerLockHeartbeat)
       this.writerLockHeartbeat = undefined
@@ -1664,7 +1664,7 @@ export class FileSystemStorage extends BaseStorage {
     }
   }
 
-  public async readWriterLock(): Promise<WriterLockInfo | null> {
+  public override async readWriterLock(): Promise<WriterLockInfo | null> {
     await this.ensureInitialized()
     const lockFile = path.join(this.lockDir, FileSystemStorage.WRITER_LOCK_FILE)
     try {
@@ -1749,7 +1749,7 @@ export class FileSystemStorage extends BaseStorage {
    * `locks/_flush_responses/` with the same request ID. Stale `.req` files
    * (>FLUSH_REQUEST_TTL_MS) are garbage-collected on every tick.
    */
-  public startFlushRequestWatcher(onRequest: () => Promise<void>): void {
+  public override startFlushRequestWatcher(onRequest: () => Promise<void>): void {
     if (this.flushWatcherInterval) return // already watching
     this.flushWatcherOnRequest = onRequest
 
@@ -1772,7 +1772,7 @@ export class FileSystemStorage extends BaseStorage {
     }
   }
 
-  public stopFlushRequestWatcher(): void {
+  public override stopFlushRequestWatcher(): void {
     if (this.flushWatcherInterval) {
       clearInterval(this.flushWatcherInterval)
       this.flushWatcherInterval = undefined
@@ -1851,7 +1851,7 @@ export class FileSystemStorage extends BaseStorage {
    * Inspector side: drop a `.req` file and poll for the corresponding `.ack`.
    * Returns true if the writer acknowledged in time, false on timeout.
    */
-  public async requestFlushOverFilesystem(timeoutMs: number): Promise<boolean> {
+  public override async requestFlushOverFilesystem(timeoutMs: number): Promise<boolean> {
     await this.ensureInitialized()
     const reqDir = path.join(this.lockDir, FileSystemStorage.FLUSH_REQUEST_DIR)
     const ackDir = path.join(this.lockDir, FileSystemStorage.FLUSH_RESPONSE_DIR)

src/storage/adapters/memoryStorage.ts

@@ -69,7 +69,7 @@ export class MemoryStorage extends BaseStorage {
    *
    * @returns Memory-optimized batch configuration
    */
-  public getBatchConfig(): StorageBatchConfig {
+  public override getBatchConfig(): StorageBatchConfig {
     return {
       maxBatchSize: 1000,
       batchDelayMs: 0,
@@ -86,7 +86,7 @@ export class MemoryStorage extends BaseStorage {
    * Initialize the storage adapter
    * Calls super.init() to initialize GraphAdjacencyIndex and type statistics
    */
-  public async init(): Promise<void> {
+  public override async init(): Promise<void> {
     await super.init()
   }
 

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>
 }