fix(tray): forward --listen to the spawned core process

[electrolobzik]

Bug

mcpproxy-tray serve --listen 0.0.0.0:8181 silently drops the --listen flag on macOS (reproduced on tray v0.43.0):

• The tray log shows the core spawned as /bin/zsh -l -c exec '/mcpproxy' 'serve' — no --listen.
• lsof confirms the core then listens on the config-file value (default 127.0.0.1:8080); nothing ever opens the advertised port, so any tooling that probes it concludes the daemon is down.

Root cause

cmd/mcpproxy-tray/main.go never parses its own command line — serve --listen … is ignored entirely. On macOS resolveCoreURL() prefers the unix socket for tray↔core communication (#102), and buildCoreArgs() only derives --listen for TCP/HTTP core URLs, so on the socket path the core is spawned with no --listen at all and falls back to the config default.

Fix

• New trayListenFromArgs() parses --listen/-l (both space and = forms) from the tray's argv; other args remain ignored as before. Malformed values (dangling flag, empty = form, value starting with -) are skipped and scanning continues to the first valid value.
• buildCoreArgs() now always forwards an explicit CLI --listen to the spawned core's argv — including when the tray talks to the core over the socket/pipe, since the socket only covers tray↔core communication while the core must still open the advertised TCP address. Both the login-shell-wrapped spawn and the direct-exec fallback consume the same argv.
• URL/env-derived --listen behavior for TCP endpoints is unchanged.

Tests

• TestTrayListenFromArgs covers both flag forms plus the malformed-input regressions (--listen --config path, --listen= --listen :8181, dangling -l, continue-scan to a later valid --listen=:9090).
• TestBuildCoreArgs_ForwardsCLIListenOverSocketEndpoint — regression: CLI listen forwarded over a socket endpoint; no --listen on socket endpoints without the flag.
• CI on our fork built all platform artifacts (incl. darwin-arm64) green: fix(tray): forward --listen to the spawned core process HaloCollar/mcpproxy-go#7

🤖 Generated with Claude Code

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!