v0.10.0

Minor: the adoption funnel is now measurable (PR #257). setup and
integrations runs emit the standard content-free cli_run event (previously
invisible — the strict schema dropped uncatalogued command names), and a
non-zero cli_run now carries an exitClass enum classifying deliberate
failures: no-session-match | invalid-arguments | budget-exceeded |
not-comparable | other-controlled. Thrown errors keep their separate
cli_error/errorClass channel; the two never double-report a run.
Motivation: the 2026-07-10/11 launch cohort's most common event was a
receipt-class run exiting non-zero with no diagnosable cause. Everything stays
content-free (SPEC-0043 amended; docs/telemetry.md in schema-pinned parity):
the class only — never selectors, paths, or messages. The hidden pre-push hook
and statusline polling remain telemetry-silent.