feat: bootstrap — working web terminal (ghostty-web port)

[jesse23]

Summary

Port the ghostty-web demo into wtty as the first working slice — a full-screen terminal running in a browser tab backed by a real PTY.

What's included

• Server — single HTTP + WebSocket server (src/server.ts) serving the terminal HTML inline, ghostty-web assets, and PTY sessions on port 2346
• Dual PTY adapter — Bun.Terminal when running under Bun (native, no addon), @lydell/node-pty under Node.js; runtime detected automatically via process.versions.bun
• Full-screen terminal — Dracula theme, FiraMono Nerd Font, no chrome, fills the entire browser tab
• SPEC + ADR — docs/specs/wtty.md and docs/adrs/001.wtty.bootstrap.md documenting the architecture and decisions

Dev scripts

```
bun run dev # Bun.Terminal (recommended)
npm run dev:node # node-pty via tsx
bun run preview # run built dist/
```

[Copilot]

Pull request overview

Ports the ghostty-web demo into wtty to establish the first functional end-to-end slice: a browser-rendered full-screen terminal backed by a real host PTY, served from a single HTTP + WebSocket server.

Changes:

• Add a single src/server.ts HTTP/WebSocket server that serves inline HTML, ghostty-web assets, and PTY-backed sessions.
• Introduce a dual PTY adapter layer (Bun vs @lydell/node-pty) with runtime detection.
• Reshape build/lint/tooling and add initial SPEC/ADR documentation for the bootstrap architecture.

Reviewed changes

Copilot reviewed 19 out of 21 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tsconfig.lint.json	Adjusts lint TS config for Node-style module resolution.
tsconfig.json	Switches TS config to noEmit (build handled by Bun).
tsconfig.dts.json	Removes DTS-only build config.
src/server.ts	Adds the single-port HTTP + WebSocket + PTY server and inline terminal client.
src/pty/types.ts	Defines a shared PtyProcess interface across adapters.
src/pty/node.ts	Implements PTY spawn/resize/write/kill using @lydell/node-pty.
src/pty/index.ts	Runtime-detects Bun vs Node and selects the appropriate PTY adapter.
src/pty/bun.ts	Implements PTY-like adapter using Bun’s terminal integration.
src/index.ts	Removes prior placeholder API.
src/index.test.ts	Removes prior placeholder test.
scripts/build.ts	Simplifies build to a single Bun build entrypoint (src/server.ts).
package.json	Adds runtime deps and dev scripts; switches project to ESM.
docs/specs/wtty.md	Adds initial wtty SPEC describing architecture and roadmap.
docs/specs/ui.md	Adds initial UI SPEC for terminal + future session manager.
docs/specs/cli.md	Adds initial CLI SPEC describing intended control surface.
docs/development.md	Updates ADR naming/layout conventions (flat docs/adrs/).
docs/adrs/001.wtty.bootstrap.md	Adds bootstrap ADR documenting the port and key decisions.
bun.lock	Locks new dependencies (ghostty-web, ws, @lydell/node-pty, tsx, etc.).
biome.json	Updates Biome schema version reference.
.github/workflows/ci.yml	Updates CI test step to run the test script.

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