chore(8.0): Phase C + D + E — config simplification, TODO sweep, test race fix

Phase C: storageAutoConfig.ts rewrite (376 LOC → ~110 LOC). The four cloud
adapters are gone so the auto-detection state machine collapses to a single
filesystem-vs-memory choice. StorageType enum is now {MEMORY, FILESYSTEM} only;
StoragePreset stays {AUTO, MEMORY, DISK}. zeroConfig.ts hard-pins
s3Available: false now that the type narrows past the runtime check.

Phase D: TODO/FIXME sweep in src/. Removed seven stale markers. The CLI cow
migrate command's backup path now uses fs.cp with recursive + force:false
instead of a TODO placeholder.

Phase E: skipped-test deletion + parallel-test race fix.
  - storage-batch-operations.test.ts loses its "Cloud Adapter Batch
    Operations" block (GCS/S3/Azure tests, 88 LOC).
  - cow-full-integration.test.ts loses its skipped "S3 adapter" test.
  - create-entities-default.test.ts had testDir hardcoded to
    './test-create-entities-default'; parallel vitest shards collided on
    the writer lock. testDir is now os.tmpdir() + pid + random, and the
    storage option is rootDirectory (the recognized key — the prior
    'path' key fell through to './brainy-data' and triggered a separate
    lock collision against any concurrent default-pathed brain). Added
    afterEach brain.close() so the lock releases before rmSync.

src/cli/commands/cow.ts

@@ -136,11 +136,9 @@ ${chalk.cyan('Fork Statistics:')}
         const marker = isCurrent ? chalk.green('*') : ' '
         const name = isCurrent ? chalk.green(branch) : branch
 
-        // Get branch info
-        // TODO: Re-enable when COW is integrated into BaseStorage
-        // const ref = await brain.storage.refManager.getRef(branch)
-        // const age = ref ? formatAge(Date.now() - ref.updatedAt) : 'unknown'
-
+        // Branch-info enrichment (last-commit timestamp, etc.) requires a
+        // refManager accessor that brainy hasn't surfaced on the public
+        // storage adapter yet. CLI shows the bare branch name for now.
         console.log(`  ${marker} ${name}`)
       }
 
@@ -360,10 +358,8 @@ ${chalk.cyan('Fork Statistics:')}
       if (options.backup) {
         const backupPath = `${fromPath}.backup-${Date.now()}`
         spinner = ora(`Creating backup: ${backupPath}...`).start()
-
-        // TODO: Implement backup
-        // await copyDirectory(fromPath, backupPath)
-
+        const fs = await import('node:fs/promises')
+        await fs.cp(fromPath, backupPath, { recursive: true, force: false })
         spinner.succeed(`Backup created: ${chalk.green(backupPath)}`)
       }
 

src/cli/interactive.ts

@@ -7,7 +7,6 @@
 
 import chalk from 'chalk'
 import inquirer from 'inquirer'
-// import fuzzy from 'fuzzy'  // TODO: Install fuzzy package or remove dependency
 import ora from 'ora'
 import { Brainy } from '../brainy.js'
 import { getBrainyVersion } from '../utils/version.js'