fix: bundle all runtime assets (extensions, docs)

[jack-work]

Summary

Bundle extensions/ and docs/ in a single cp command alongside other runtime assets.

Before:

cp -r dist node_modules package.json ui "$out/lib/moltbot/"
if [ -d extensions ]; then
  cp -r extensions "$out/lib/moltbot/"
fi

After:

cp -r dist node_modules package.json ui extensions docs "$out/lib/moltbot/"

Fixes

• Fixes Bug: extensions directory not included in package build #6 — Bug: extensions directory not included in package build
• Fixes extensions/ directory not bundled, causing 'plugin not found' errors for telegram/discord #14 — extensions/ not bundled (plugin not found errors)
• Fixes docs/reference/templates not bundled, causing 'Missing workspace template' error #18 — docs/reference/templates not bundled (missing workspace template errors)

Test plan

• Build gateway package
• Verify extensions/ and docs/reference/templates/ exist in output
• Run gateway with Telegram channel configured
• Confirm workspace bootstrapping works

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