fix: pass embedding providerMetadata to usageHandler - #393

{ "workflowData": { "owner": "convex", "repo": "agent", "sha": "ff998d038b6888ec8412f946c0c8a6358d2b7787", "ref": "393", "headBranch": null }, "key": "44fKHNAYVM", "runId": 39359424825, "webhookDebug": { "action": "in_progress", "head_branch": "fix/embedding-usage-provider-metadata", "head_repository_full_name": "awpogodin/agent", "full_name": "convex/agent", "isPullRequest": true, "prNumber": 393, "prNumberType": "number", "isNewPullRequest": true, "isOldPullRequest": false, "prKey": "awpogodin/agent:fix/embedding-usage-provider-metadata", "oldPrDataHash": "7kSKy0bwLU", "lookupKey": "awpogodin/agent:fix/embedding-usage-provider-metadata", "data": { "owner": "convex", "repo": "agent", "sha": "ff998d038b6888ec8412f946c0c8a6358d2b7787", "ref": "393", "headBranch": null } }, "currentCursor": { "sha": "6503999ead876a1b185e690b4229d10d72cbdb12", "timestamp": 39359033024 } }