docs(#381): route bugsink alerts to discord

[zgeoff]

Description

Part of #381. Bugsink new-issue, regression, and unmute alerts post to the alarms Discord channel via a per-project webhook config; this PR documents that delivery path.

• README gains an Alerts section: webhook-only alerting, the bugsink-discord-webhook vault item, and the per-project setup step for new projects.
• The deployment doc's Bugsink stand-up now includes adding the webhook to each project.
• No outgoing email is configured — alerting stays webhook-only.

Testing

• bun run typecheck passes
• bun run test passes
• bun run lint passes
• New tests added for new functionality

Docs only — delivery verified live: test events on every project, no webhook failures recorded.

[coderabbitai]

Important

Review skipped

Auto incremental reviews are disabled on this repository.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: ff197056-8f5a-4e83-b025-7e2e37a506f1

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

📝 Walkthrough

Walkthrough

Bugsink now includes Resend SMTP environment settings, provisions EMAIL_HOST_PASSWORD, and documents alert delivery configuration and per-project alert toggles.

Changes

Bugsink alert email

Layer / File(s)	Summary
Configure Bugsink SMTP alerts apps/bugsink/fly.toml, apps/bugsink/README.md	Fly configuration adds SMTP host, username, and sender settings; README documents Resend-based alert delivery and project-level alert toggles.
Provision and document the SMTP secret docs/architecture/deployment.md, apps/bugsink/README.md	Deployment documentation and provisioning commands add EMAIL_HOST_PASSWORD alongside the existing Bugsink secrets and identify it as the Resend API key.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title mentions Discord routing, but the PR actually updates Bugsink alert email docs and Resend SMTP secrets.	Rename it to reflect the actual change, such as documenting Bugsink alert email configuration via Resend SMTP.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description check	✅ Passed	The description is about Bugsink alert delivery docs and setup, which is related to the changeset.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 381-error-reporting-baseline

---

_{Comment @coderabbitai help to get the list of available commands.}

[cubic-dev-ai]

All reported issues were addressed across 3 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>