Add Linux prerequisites documentation (#8)

[Liohtml]

Description

Critical documentation: Linux prerequisites for building and running the bridge.

Changes

• docs: list Linux prerequisites (build-essential, pkg-config, libudev-dev, dialout group) #8 — Add "Linux prerequisites" section to README. Documents required system packages on fresh Linux/WSL2 installs:
  • build-essential, pkg-config, libudev-dev (required by serialport crate)
  • dialout group membership (so serial_bridge can access USB serial without sudo)
  • Includes clear post-installation steps (log out/in or wsl --shutdown for WSL).

Without these prerequisites, users encounter non-obvious build failures (linker cc not found, libudev-sys build fails, permission denied on /dev/ttyUSB0). This section prevents frustration on first-time setup.

Type of Change

• Documentation update

Component

• Bridge (HTTP server, session collection)
• Serial Bridge (USB transport binary)

Testing

• Documentation only; no code changes.

Closes #8

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 1f30c19e-534d-441f-80d9-6271968b190c

📥 Commits

Reviewing files that changed from the base of the PR and between 72fbfd6 and 03e78f2.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/linux-prereqs-docs

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