PLANNOTATOR_PORT=0 spurious "Invalid" warning in local mode

[hearkenmx]

Repro

PLANNOTATOR_PORT=0 plannotator annotate README.md

Output:

[Plannotator] Warning: Invalid PLANNOTATOR_PORT "0", using default

Expected: no warning. Port 0 means "OS picks random port" — already the local-mode default.

Root cause

packages/server/remote.ts getServerPort() — common to both modes:

if (!isNaN(parsed) && parsed > 0 && parsed < 65536) {  // parsed > 0 rejects 0

Port 0 is rejected by validation, printed as warning, then the fallback returns... 0:

return isRemoteSession() ? DEFAULT_REMOTE_PORT : 0;  // identical to what was rejected

Fix

-    if (!isNaN(parsed) && parsed > 0 && parsed < 65536) {
+    if (!isNaN(parsed) && parsed >= 0 && parsed < 65536) {

One character, one file.