SMOODEV-1787: consume published smooth-operator-core; delete in-tree copy (PR 1/4)

.changeset/consume-published-operator-core.md

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+---
+'@smooai/smooth': patch
+---
+
+SMOODEV-1787 (PR 1/4, dual-engine collapse): consume the published
+`smooai-smooth-operator-core` engine instead of the in-tree copy, and
+delete the in-tree `crates/smooth-operator/`.
+
+The in-tree engine and the public `smooth-operator-core` were the same
+engine but had diverged. The only differences were (a) the public core
+gates its BigSmooth control-plane reporter behind a `bigsmooth` cargo
+feature (with a no-op stub when disabled) and (b) cosmetic
+public-sanitization edits (doc rewording, neutralized example hosts in
+tests, `smooth_operator` → `smooth_operator_core` in doc examples, a
+provider-agnostic `ModelRouting::default()`, a redacting `Debug` for
+`ProviderConfig`/`LlmConfig`, and a wider retry-status set). smooth never
+enables the `bigsmooth` feature and never sets a reporter, so the gated
+reporter calls were dormant no-ops — the cutover loses nothing.
+
+Wiring: the workspace dep KEY stays `smooth-operator` and is package-aliased
+to `smooai-smooth-operator-core`, so all ~12 consumers' `use smooth_operator::…`
+imports compile unchanged. Pinned as a rev-locked git dep (not a sibling
+path dep) to avoid the CI `cargo metadata` failure that SMOODEV-1464 hit
+with a `../`-style path dep. No functional change, no module removal — that
+lands in later PRs.