Fix prototype and super assignment parity

[andrewtdiz]

Summary

• add explicit HIR/codegen/runtime support for class instance super[property] = value using parent-prototype lookup with the current receiver
• preserve existing static-super assignment behavior and computed-key/RHS error ordering
• route inherited class setters/getter-only accessors through the super [[Set]] path, including setter alias registration and implicit-this scoping
• keep methods containing lexical SuperPropertySet out of the generic inliner so the method receiver is not lost
• add focused c262 assignment regression coverage and save the DeepWiki ecma262 reference under reference/deepwiki/

Verification

• cargo fmt --check
• git diff --check
• cargo check -p perry-transform -p perry-hir -p perry-codegen -p perry-runtime
• cargo build -p perry -p perry-runtime -p perry-stdlib
• tests/test_c262_assignment_parity.sh -> PASS
• python3 scripts/test262_focused_report.py --root vendor/test262 --perry-bin target/debug/perry --dir language/expressions/assignment --max 80 --sample-cap 1000000 --skip-build -> pass=74, diff=0, runtime-fail=6, compile-fail=0, parity=92.5%

Remaining Assignment Slice Buckets

• language/expressions/assignment/8.14.4-8-b_1.js: Object.defineProperty called on non-object
• language/expressions/assignment/8.14.4-8-b_2.js: Object.defineProperty called on non-object
• language/expressions/assignment/S11.13.1_A5_T1.js: Perry ran clean; Node rejected
• language/expressions/assignment/S11.13.1_A5_T2.js: Perry ran clean; Node rejected
• language/expressions/assignment/S11.13.1_A7_T4.js: Expected true but got false
• language/expressions/assignment/destructuring/keyed-destructuring-property-reference-target-evaluation-order-with-bindings.js: runtime panic in field_get_set.rs

Notes

• The focused regression asserts the scoped [[Set]] behavior: inherited setter receiver, computed super key-before-RHS ordering, static-super preservation, and inherited getter-only write rejection without creating an own property.
• Class prototype/accessor reads and broader object-literal home-context parity remain follow-up surfaces outside this PR's primary scope.