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Use target error rates when selecting Euler basis in Optimize1qGatesDecomposition (#16575)

* Use target error rates when selecting Euler basis in Optimize1qGatesDecomposition

The full Rust port of the pass (#12959) dropped the error map that the
Python implementation passed to unitary_to_gate_sequence, so the choice
among candidate Euler decompositions degraded to gate count with ties
broken by the fixed basis ordering.  Select the candidate by the same
target-aware (error, gate count) metric the pass already uses for its
replace/keep decision; without a target the comparison still reduces to
gate count.

The C API test expectations for the rz_ry_u target are updated: with
error-aware selection the pass now emits RY(pi/2)-RZ(pi) (total error
~3e-4) instead of a single U gate (5e-4) for a run of H gates.

Fixes #16460

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* Address review: compute basis error once, add no-error test

Compute each candidate's error a single time in resynthesize_run_min_error
and return it, so the winning run's error is not recomputed at the call
site.  Add a companion test covering the no-error (gate-count fallback)
path for the rz/rx basis family.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

112902 of 128824 relevant lines covered (87.64%)

997967.33 hits per line

Coverage Regressions

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Jobs
ID Job ID Ran Files Coverage
1 29476135805.1 952
87.64
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Source Files on build 29476135805