Real bug: `agnes push` was reading `<workspace>/user/sessions/`, but
Claude Code writes session jsonls to `~/.claude/projects/<encoded-cwd>/`
and nothing on the analyst side ever copies them across. The SessionEnd
hook ran `agnes push` happily and uploaded zero sessions every time.
`cli/lib/claude_sessions.py` probes both Claude Code encoding variants
(older `/`→`-` keeping spaces+tildes; newer all-non-alphanumeric→`-`
with collapsed runs) and unions whichever exist. Users who upgraded
Claude Code mid-project end up with both encoded dirs side-by-side on
disk; the union ensures no session is left behind. Same-named jsonl in
both dirs → newest mtime wins. `<workspace>/user/sessions/` survives as
a fallback for any setup that explicitly mirrors sessions there.
Verified on real disk: helper returns 2 dirs + 8 unioned session files
for the Agnes-test workspace where the previous code returned 0.
