fix(rubric): harden G-theory pilot control callbacks

[seonghobae]

Scope

Fix #881 at the generated-item G-theory pilot handoff validation boundary without changing G-theory arithmetic or Rust numerical ownership.

Test-first lineage

• RED public-handoff regressions: 548c83ce22465b4068346811b074825253c98a6c.
• Initial exact-type implementation: eba56e35d0ef0a8aa03e41f8a2d2a91f4a3c1433.
• Changelog / doctoring evidence: 3d213cd3083b6082a45212f4841b4dfc0cf51877 / 900e21c537d5e79127ab22c17fc1d851df895f2d.
• Genuine NumPy-subclass test construction correction: 77cea62c9c6692b3a9aa335dabd67d7f85bd2371.
• RED metaclass-dispatch regression: 0d79240fda99c5aa0c29f6b84c9f200d8d66a26a.
• GREEN identity-only scalar-type admission: a734e01a872c7aaabf19a74b1fc212d88d4d084f.
• Exact current head 9f527f316487fb0338f2eb6570d8f42924d42b14 repairs the release fragment to the repository's required level-one-title / classified-section grammar after the same format defect was reproduced on the parallel testlet-pilot lane.

The implementation uses identity-only comparisons before trusted NumPy conversion, so caller-controlled metaclass hashing/equality cannot participate in control admission.

Boundaries

• preserve the 64-row materialization limit and 1..=1_000_000 D-study-size domain;
• preserve finite mastery-cut semantics;
• preserve genuine NumPy integer/floating scalar compatibility;
• reject caller-defined numeric/protocol subclasses before conversion, representation, hashing, or equality callbacks;
• Python remains validation/marshalling only;
• no formula, estimator, provider, dependency, database, workflow, release-version, or gate change.

Exact current state

• Protected base: fb67ced09d8ee00542c05d56374537a9a7239751.
• Exact source head: 9f527f316487fb0338f2eb6570d8f42924d42b14.
• GitHub reports the PR mergeable and Ready for review.
• Exact-head CI completed successfully, including Python 3.12/3.14, Rust, package, GPU smoke, and fuzz.
• Exact-head Security Scan and SAST Semgrep completed successfully; the 33 current check-runs contain no failure or in-progress result.
• No formal submitted review or unresolved inline review thread is present.
• Integration still requires the protected-main qualifying independent non-author approval and all live required contexts at merge time. No gate is weakened or bypassed.

Any future source-head or protected-base movement invalidates this evidence and requires a fresh sweep.

Fixes #881.

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📥 Commits

Reviewing files that changed from the base of the PR and between fb67ced and 9f527f3.

📒 Files selected for processing (4)

• docs/changelog.d/881-rubric-gtheory-pilot-control-callbacks.md
• docs/doctoring/rubric_gtheory_pilot_control_callbacks.md
• python/fast_mlsirm/rubric/gtheory_pilot.py
• tests/test_rubric_gtheory_pilot_control_callbacks.py

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