feat(infra): hand the /calendar gateway route to calendar-service

[gbirman]

Removes /calendar and /calendar/* from the email-service gateway target group so email-service is back to owning only /email and /email/*, letting calendar-service's /calendar rule at priority 140 take over. This is the cutover step and must be merged only after (a) calendar-service's /calendar rule PR is deployed, (b) calendar_service's CALENDAR_SYNC_ENABLED is on and the agent-tools client repoint is deployed, and (c) email_service's CALENDAR_SYNC_ENABLED is off.

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Note

High Risk
Production ALB path cutover for calendar webhooks; deploying before the documented prerequisites can break or misroute /calendar traffic.

Overview
Cuts over gateway routing so calendar-service owns /calendar traffic instead of email-service.

The email-service ServiceTargetGroup path patterns shrink from also matching /calendar and /calendar/* to only /email and /email/*. Inline comments replace the old webhook note with cutover ordering: deploy only after calendar-service’s /calendar listener rule is live, calendar sync is enabled there (with agent-tools repointed), and email-service has calendar sync disabled—otherwise /calendar requests and webhooks can be unroutable or handled by the wrong service.

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[macro-application]

Extract calendar sync into its own service (same database)

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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Updated request routing so email service endpoints handle only /email paths.
  • Calendar paths are now routed exclusively to the calendar service.

Walkthrough

The email service gateway listener rule now matches only /email and /email/*. It no longer matches /calendar or /calendar/*. The rule comment identifies calendar-service as the owner of /calendar and documents the cutover deployment.

Priority: ➖ Normal

Merge Risk: 🟡 Moderate · up to 9d3ab

Document the complete calendar cutover sequence before merging to reduce the risk of misrouting requests and webhooks during deployment.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses the conventional commits format with the "feat" type, describes the gateway route cutover, and is 65 characters long.
Description check	✅ Passed	The description accurately explains the route changes, cutover behavior, production risk, and required deployment prerequisites.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@infra/stacks/email-service/service.ts`:
- Around line 107-109: Expand the cutover comment near the calendar routing rule
to document all prerequisites: deploy the calendar-service rule first, enable
CALENDAR_SYNC_ENABLED for calendar-service, deploy the agent-tools client
repoint, and disable CALENDAR_SYNC_ENABLED for email-service before this rule is
changed.

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• infra/stacks/email-service/service.ts

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