docs: fix outdated EmitLocalEvent reference (Pylon #3303)

[mmasales]

Fixes outdated EmitLocalEvent reference
The subscription-on-start docs page referenced ctx.EmitLocalEvent(), which was renamed to ctx.EmitEvent(). Confirmed against the current interface in router/core/subscriptions_modules.go — no remaining EmitLocalEvent references anywhere in the codebase or docs site. Updated all 5 occurrences on the page.
Reported via Pylon #3303.

Summary by CodeRabbit

• Documentation
  • Updated the subscription-on-start handler guide to use the current EmitEvent() API.
  • Revised the handler context reference and initial-events example, including emission success checks and warning guidance.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c194c06b-41f9-43e1-9a62-0f7b2e7fa213

📥 Commits

Reviewing files that changed from the base of the PR and between f6ed7c9 and 54e7e5d.

📒 Files selected for processing (1)

• docs-website/router/cosmo-streams/custom-modules/subscription-on-start.mdx

---

Walkthrough

Changes

Subscription start documentation

Layer / File(s)	Summary
Update event emission API references docs-website/router/cosmo-streams/custom-modules/subscription-on-start.mdx	The handler context contract, explanatory text, and initial-event example now use EmitEvent instead of EmitLocalEvent; existing emission-failure warning behavior is unchanged.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the docs-only rename from EmitLocalEvent to EmitEvent and matches the main change.
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.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

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

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
wundergraphinc	🟢 Ready	View Preview	Jul 14, 2026, 9:49 PM

💡 Tip: Enable Workflows to automatically generate PRs for you.

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
wundergraphinc	🟡 Building	–	Jul 14, 2026, 9:48 PM

💡 Tip: Enable Workflows to automatically generate PRs for you.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.