Two real bugs surfaced today:
1. compile_project / get_compile_messages reported 0 errors even when
the IDE's download path saw real compile errors. Root cause: both
scripts queried get_message_objects() with no category arg, which
returns only the IDE's last-active message tab (typically "Other"
for the WATCHER startup messages). Build/Code-Generation errors
live in a different category and were never queried.
Fix: enumerate script_engine.system.message_categories AND probe a
set of well-known V3.5 category GUIDs (Compile, Build, Online,
LibMan); query target_app.get_message_objects(cat) and
system.get_message_objects(cat) per category; aggregate dedup'd
entries (severity, text, object, line). Each entry now carries its
originating category label.
2. add_library's post-add _is_resolved() check trusted is_placeholder
== False as proof of resolution. CODESYS lets you call
add_placeholder(name_str) for a name that is NOT in the installed
Library Repository -- the resulting reference reports
is_placeholder=False yet has empty effective_version and the IDE
shows it with a yellow-warning triangle in Library Manager (no
Effective Version column populated). Karstein hit this with
"OPC UA PubSub SL": list_project_libraries reported it as
[managed] but compile failed because the IDE couldn't resolve it.
Fix: for the non-placeholder branch, probe effective_version /
resolved_version / version / resolved_library / managed_library /
library. ALL must be empty/None for the ref to be considered
hollow. Logs a DEBUG with the ref's attribute list so the next
such bug is diagnosable without source spelunking.
Bumped 0.6.2 -> 0.6.3.
