docs: multi-tenant applications and concurrency limits

[isshaddad]

Adds an example of multi-tenant applications as alternative to project/limit increase, and more info about queue times and concurrency

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[coderabbitai]

Walkthrough

This pull request adds documentation content across three files. The deploy-environment-variables guide expands with a multi-tenant approach section that explains loading tenant-specific secrets at runtime via services like AWS Secrets Manager, includes a code example using SecretsManagerClient, and outlines benefits. The limits documentation introduces a new Projects section specifying a per-organization limit of 10 projects across all pricing tiers, along with concurrency allocation notes. The troubleshooting guide adds a new item addressing runs waiting in queues due to concurrency limits, providing diagnostic steps and remediation guidance.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is minimal and lacks required sections from the template (Testing, Changelog details, and Checklist). While it conveys the general purpose, critical template sections are missing or incomplete.	Complete the required template sections: add Testing details, expand Changelog description, and fill out the Checklist items with appropriate confirmations.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The pull request title accurately summarizes the main changes: documentation updates about multi-tenant applications and concurrency limits, which directly align with the file modifications in deploy-environment-variables.mdx, limits.mdx, and troubleshooting.mdx.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/concurrency-and-environment-limits

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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

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[vibe-kanban-cloud]

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