Evan Reichard e3d7c28820 feat: add persistent browser server with auto-discovery ...

Add `glimpse serve` which starts geckodriver + Firefox and proxies
WebDriver requests through a Unix socket at
$XDG_RUNTIME_DIR/glimpse-<uid>.sock. All commands auto-discover the
socket and reuse the running browser session (~300ms vs ~2-3s per
command).

The proxy intercepts session create/delete to keep Firefox alive:
new session requests return the existing session ID, delete session
navigates to about:blank instead of closing Firefox.

- `glimpse serve` starts in foreground, logs to stderr
- `glimpse serve --stop` sends shutdown via socket
- `glimpse serve --status` prints JSON status
- SIGTERM/SIGINT do full cleanup (Firefox + geckodriver + socket)
- Second instance detected and rejected with exit code 1
- GLIMPSE_SOCKET_PATH env var for test isolation
- Three new smoke tests for serve lifecycle

2026-05-02 20:32:23 -04:00

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