v0.7.0

Minor: telemetry now defaults to enabled in CI, reversing the v0.6.x CI-default-off behavior.
Automated CI runs (e.g. the pr-check action) are now counted by default, so CI adoption shows up
in the data. CI is no longer special-cased — the isCI field still distinguishes CI from human
runs. Both kill switches still win everywhere: set AIRECEIPTS_TELEMETRY=off (or 0/false)
or DO_NOT_TRACK=1 to disable telemetry in CI or anywhere; an empty/malformed connection string
also disables. Telemetry payloads remain content-free (no transcript, prompts, file paths, repo
names, or dollar amounts — invariant I4). See SPEC-0002's 2026-07-08 amendment and docs/telemetry.md.