Diagnostics, completion, and hover
Visible pc! and pcx! literals receive parser diagnostics, catalog-backed completion, and inspectable utility information.
Cancel stale document work
Document version changes cancel obsolete checks. Independent process deadlines prevent an unchanged document from waiting forever on a stalled compiler.
Bound untrusted output
stdout and stderr are read under explicit caps. Oversized or timed-out compiler responses become diagnostics instead of unbounded memory growth.