Close pass four: undetented host curve read, LiveValues guard, ordering assert, static-lane fix, docs

Points toPlain's exponent arm at the undetented curve map so host reads
match the editor; adds a sizeof guard plus field-poison test for
LiveValues::operator==; skips the model write when an automation value
hasn't moved; corrects five stale doc citations.

docs/product/parameter-automation.md

@@ -335,6 +335,12 @@ invariant Θ-W1-T1 was run to establish.
 > outranks anything the plugin sets, because the host replays it. That is inherent to
 > automation and is not a defect to design away — but it has one sharp consequence for the
 > resample bake, and that is §9.
+>
+> **Superseded by the paragraph immediately below.** "Outranks anything the plugin sets" reads
+> as unbounded; the bounded formulation there — outranks only until the model has caught up,
+> never a later restore/reset/knob move — is the correct one and the one `shell/instrument/
+> CLAUDE.md`'s Authority section and `core/instrument/param/param_merge` implement. An unbounded
+> hold was tried and is the specific defect this history keeps.
 
 **SETTLED at the track, from the vendored SDK.** The delivery question the `[verify]` here
 bundled is answered by the headers rather than by the DAW: `setParamNormalized` is documented as