fix(plugins): swap speculative Remote backends for real ActivepiecesMemoryBackend

[rrader26]

Summary

PR #35 shipped `RemoteMemoryBackend` + `RemoteRecipeBackend` against a REST contract we never built. They were marked "v1 proposal" — pure stubs. This PR removes them and replaces with a real production-ready `ActivepiecesMemoryBackend` that hits live endpoints.

What changes

Removed (stubs):

• `src/plugins/memory/remote-backend.ts`
• `src/plugins/recipes/remote-backend.ts`
• both stub test files

Added (real):

• `src/plugins/memory/activepieces-backend.ts` — hits the actual Activepieces `/v1/projects/:projectId/[chatbots/:chatbotId/]memory` endpoints
• `test/memory/activepieces-backend.test.ts` — 20 tests against mocked fetch

What ActivepiecesMemoryBackend does

• Auth: `Authorization: Bearer sk-` against the Activepieces Service-principal flow
• Search: routes `agentmark_memory_search` to Activepieces' hybrid vector + BM25 endpoint — Claude Code / Cursor / Codex agents get semantic memory search for free
• Scope-aware: all five agentmark scopes (platform/project/agent/user/session) map directly to Activepieces' same enum
• No data collision: stamps every write with `source: "agentmark"` and filters every read by the same — agentmark records don't mix with manually-created Activepieces memories

Mapping

agentmark	Activepieces
`key`	`metadata.agentmark_key`
`value`	`content` (string-coerced) + `metadata.raw_value` (preserves type)
`scope.type`	`scope` (same five-level enum)
`scope.id`	`metadata.scope_id`
`tags`	`metadata.tags`

Recipes

NO `ActivepiecesRecipeBackend` ships in this PR. Activepieces has no recipes endpoints yet; we don't ship a stub. The `RecipeBackend` interface + `LocalFileRecipeBackend` remain — when the service ships, the real backend lands then.

Usage (post-merge)

```ts
import { createMemoryPlugin, ActivepiecesMemoryBackend } from '@thinkfleet/agentmark'

const memory = createMemoryPlugin({
backend: new ActivepiecesMemoryBackend({
baseUrl: 'https://app.thinkfleet.ai',
apiKey: process.env.AP_API_KEY, // sk-...
projectId: process.env.AP_PROJECT_ID,
chatbotId: process.env.AP_CHATBOT_ID, // optional
}),
})
```

Test plan

• `pnpm build` clean
• `pnpm test` — 491 pass / 10 skip (20 new for Activepieces backend; all 471 prior tests still pass)
• Manual: configure with a real Activepieces API key + project, store a memory from Claude Code, verify via Activepieces UI that the record appears with `source=agentmark`

🤖 Generated with Claude Code