docs: add BMad Ecosystem cross-links to sidebar

[bmadcode]

Summary

• Adds a "BMad Ecosystem" sidebar group linking to BMad Method, BMad Builder, Game Dev Studio, and TEA docs sites
• Links open in new tabs

Test plan

• Sidebar config follows same pattern verified on BMad Method dev server

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 70f57c16-7e52-4a2e-949d-9b657ea37575

📥 Commits

Reviewing files that changed from the base of the PR and between 13af166 and 575201b.

📒 Files selected for processing (1)

• website/astro.config.mjs

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🧪 Generate unit tests (beta)

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[augmentcode]

🤖 Augment PR Summary

Summary: Adds a new “BMad Ecosystem” group to the Starlight sidebar to cross-link related BMad documentation sites.

Changes:

• Introduces sidebar entries for BMad Method, BMad Builder, Game Dev Studio, and Test Architect (TEA)
• Configures the external links to open in new tabs via target="_blank"

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

website/astro.config.mjs:111 — Links opened with target: '_blank' should generally also set rel="noopener noreferrer" to avoid reverse-tabnabbing and ensure the new tab can’t manipulate the opener window.

Severity: medium

Other Locations

• website/astro.config.mjs:112
• website/astro.config.mjs:113
• website/astro.config.mjs:117

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