feat: add memvid as provider

[PhantomInTheWire]

motivation: for the memes and twitter drama

[PhantomInTheWire]

cc @Dhravya @Prasanna721

[sentry]

Bug: The put method from the @memvid/sdk returns Promise<void>, but the code incorrectly expects it to return a document ID, resulting in frameId being undefined.
_{Severity: CRITICAL | Confidence: High}

🔍 Detailed Analysis

The put method from the @memvid/sdk is documented to return a Promise<void>, meaning it does not resolve with any value. However, the code at src/providers/memvid/index.ts:63 attempts to assign the result of this promise to a frameId variable. This variable will consequently be undefined. The code then proceeds to call String(frameId), which evaluates to the literal string "undefined". As a result, every document ingested through this provider will be assigned the same invalid document ID of "undefined", breaking any downstream functionality that relies on unique document tracking.

💡 Suggested Fix

Since the put method from the @memvid/sdk does not return a document ID, the logic for tracking ingested documents needs to be revised. Remove the assignment of the await this.client.put(...) result to frameId and adjust the documentIds array accordingly, as it's not possible to retrieve IDs from this specific call.

🤖 Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: src/providers/memvid/index.ts#L63

Potential issue: The `put` method from the `@memvid/sdk` is documented to return a
`Promise<void>`, meaning it does not resolve with any value. However, the code at
`src/providers/memvid/index.ts:63` attempts to assign the result of this promise to a
`frameId` variable. This variable will consequently be `undefined`. The code then
proceeds to call `String(frameId)`, which evaluates to the literal string "undefined".
As a result, every document ingested through this provider will be assigned the same
invalid document ID of "undefined", breaking any downstream functionality that relies on
unique document tracking.

_{Did we get this right? 👍 / 👎 to inform future reviews.
Reference ID: 8252104}

[mahimairaja]

Nice