Only modern zstd frame decompression is needed for coredumps.
Disabling default features (legacy, arrays, zdict_builder) saves
~104 KB (~10%) on the pstack binary.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Linux process names are arbitrary bytes, so representing them as String
was lossy.  Switch comm() to return OsString and defer to_string_lossy()
to display boundaries.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Split the monolithic read_cmdline/read_environ source methods into
separate initial/current/fallback variants, moving the orchestration
and lossy tracking into ProcHandle. This eliminates per-source Cell
state and returns the lossy flag inline from read_cmdline.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Add a -w/--wrap flag to allow lines to wrap; by default, lines are
truncated to the terminal width (via TIOCGWINSZ or ).

Refactor cmd_summary_from() to return a String instead of printing
directly, enabling callers to measure and truncate the line before
output.

Co-authored-by: Claude Opus 4.6 <[email protected]>

Read /proc/sys/kernel/pid_max to determine the maximum PID digit count
and left-align PIDs to that width, so the tree output stays aligned
regardless of PID length.

Co-authored-by: Claude Opus 4.6 <[email protected]>

…Ds (#111)

When multiple target PIDs share common ancestors, merge their ancestry
chains into a single tree instead of printing redundant separate trees.
This builds a pruned children map from ancestor chains and renders a
unified output where ancestor-only nodes show pruned branches and target
PIDs expand their full subtrees.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

…113)

Co-authored-by: Claude Opus 4.6 <[email protected]>

The DEBUGINFOD_URLS removal was only in the pstack binary, but any tool
that creates a dwfl session (penv, pargs, pauxv — both live and core)
could trigger network requests to debuginfod servers when resolving
symbols. Move the removal into the shared dwfl constructor layer so it
applies to all callers.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>