Tier 1 — pre-step skip conditions:
when: <remote shell expr> skip unless expr exits 0
creates: <remote path> skip if path already exists
removes: <remote path> skip if path is already absent
Any of the three saying "skip" marks the step `skipped` and moves on.
Evaluated under bash -c on the remote so `!`, `[[`, pipes etc. behave
consistently regardless of the default remote shell.
Tier 2 — post-step change detection:
changed_when: <remote shell expr>
Evaluated after a successful step. Exit 0 → step counts as `changed`
(default). Exit != 0 → `ok` (ran, nothing actually different).
Without this field, successful steps default to `changed`, matching
Ansible's shell/command defaults. Useful on verify steps:
`changed_when: "false"` reports them as `ok` since they only attest.
Status model moved from pass/fail to four states:
ok / changed / failed / skipped
Summary reports each count; overall outcome is CHANGED if any step
changed, OK if none did, FAILED on any non-skipped failure.
Rerunnable smoke: playbooks/elway-smoke.yaml now proves it. On a
clean target the cold run reports 4 changed, 3 ok. Rerunning with
the same vars reports 2 skipped / 2 changed (upload + log-record
have no idempotency hooks and are always `changed`). Overriding
--var greeting=... re-runs the gated step exactly as intended.
Doc block at the top of the script updated with the new schema
fields and state machine.
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