Reuses cli.update_check.check() for the version probe — extended with
bypass_disabled=True so explicit user-typed self-upgrade is not silenced
by AGNES_NO_UPDATE_CHECK (which is for the implicit warning loop).
Install path: uv tool install --force when uv is on PATH; otherwise
curl + pip via sys.executable (NOT system python3, NOT --user — both
would land outside the agnes venv and silently no-op the upgrade).
Smoke test execs the binary at the install-resolved path (uv tool dir
joined with agnes-the-ai-analyst/bin/agnes, or sys.executable's sibling
agnes for pip) — never via shutil.which, which can resolve a stale shadow
on PATH and produce a false-positive smoke pass on the OLD version. Smoke
also asserts --version output contains info.latest via PEP 440 Version()
equality (so 0.40.0 does not falsely match 0.40.10).
On smoke fail: rollback to last_known_good.json (written only after a
previous run's smoke passed). Rollback rc is captured and surfaced on
stderr if it also fails. First-ever upgrade or unrecoverable rollback
prints the canonical bootstrap recovery: curl -fsSL <server>/cli/install.sh | bash.
AGNES_SELF_UPGRADE_IN_PROGRESS=1 is set for the duration of the run
and propagated to the smoke-test subprocess. Layer B's _check_version_headers
honors the sentinel and skips the < min hard-stop, so an in-flight
upgrade can never sys.exit(2) itself.
--force invalidates the update_check cache BEFORE probing. --force +
offline = exit 1 with explicit stderr (without --force, offline is silent).
--quiet suppresses progress output but never gags failure stderr.
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