Summary

• Adds standard BROWSER env var as a fallback between PLANNOTATOR_BROWSER and system defaults in packages/server/browser.ts
• VS Code sets BROWSER automatically in devcontainers, so this enables automatic browser opening with no Plannotator-specific config
• Updates remote/devcontainer docs and env var reference
• Fixes .gitignore pattern that was excluding docs/reference/ directory (adds 3 previously missing reference docs)

Closes #119

Fallback chain

1. PLANNOTATOR_BROWSER (explicit override)
2. BROWSER (standard convention, VS Code sets this in devcontainers)
3. System default (open / xdg-open / cmd.exe)

No changes to remote mode — PLANNOTATOR_REMOTE=1 still skips browser opening entirely.

Test plan

• PLANNOTATOR_BROWSER=firefox still takes priority over BROWSER
• BROWSER=/usr/bin/chromium opens chromium when PLANNOTATOR_BROWSER is unset
• Neither set → system default still works
• Remote mode still skips browser opening
• Reference docs now render at plannotator.ai

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