fix: resolve CI failures from PR #7575 and related PRs on main

[noanflaherty]

Summary

Fixes CI failures on main introduced by the cascade of PRs #7575, #7539, #7596, and #7595.

Root causes and fixes:

1. DrizzleError on DELETE FROM conversations (call-orchestrator, relay-server, call-routes-http, twilio-routes tests): PR M2: Call orchestrator migration to provider abstraction #7596 migrated the call orchestrator to use provider abstraction, which now calls conversationStore.addMessage() creating rows in the messages table. The messages table has a FK to conversations without CASCADE delete, so resetTables() failed when trying to delete conversations with existing messages. Fixed by adding DELETE FROM tool_invocations and DELETE FROM messages before DELETE FROM conversations.

2. readHttpToken export not found (computer-use-session-working-dir, call-orchestrator, relay-server, call-routes-http, twilio-routes tests): PR feat: voice first-class channel + cross-channel guardian notifications #7539 introduced guardian-dispatch.ts which imports readHttpToken from platform.ts. Platform mocks missing this export caused Bun module resolution failures. Fixed by adding readHttpToken: () => null to all affected platform mocks.

3. SQLiteError: unable to open database file (11 session tests): PR feat: voice first-class channel + cross-channel guardian notifications #7539 added getPendingDeliveryByConversation() call in session-process.ts which triggers DB access via guardian-action-store.ts. Session tests with minimal platform mocks didn't mock this module. Fixed by adding guardian-action-store.js mock to all 11 session test files.

4. Missing memory config (relay-server, call-orchestrator): conversationStore.addMessage() calls getConfig().memory for indexing, but config mocks didn't include the memory field. Fixed by adding memory: { enabled: false } to config mocks.

5. IPC snapshot mismatch (ipc-snapshot test): Test data used conv-guardian-001/call-001 but snapshot had conv-guardian-req-001/call-guardian-001. Fixed by updating snapshot to match test data.

CI run: https://github.com/vellum-ai/vellum-assistant/actions/runs/22337653883

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.