fix(runtime): preserve URL state in subclasses

[proggeramlug]

Summary

• construct implicit and explicit URL subclasses through the branded builtin constructor path
• preserve the subclass prototype while retaining URL parsing state
• teach static instanceof URL lowering about branded and recorded-prototype URL instances
• add parity coverage for relative URLs, subclass fields, and both constructor forms

Fixes #10639

Root cause

URL was absent from the exotic builtin constructor lists used by implicit derived constructors and explicit super(...) calls. The explicit path also classified URL as a runtime-valued parent, so it could be invoked through the plain call path instead of the builtin construct path. Instances kept their subclass shape but never received URL state.

Validation

• focused parity fixture test_gap_10639_url_subclass: 1/1 passed, 100% parity
• cargo build --profile perry-dev -p perry -p perry-runtime-static -p perry-stdlib-static
• cargo fmt --all -- --check
• git diff --check
• ./scripts/check_file_size.sh

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between e27f0a0 and b921d04.

📒 Files selected for processing (8)

• changelog.d/11090-url-subclass-state.md
• crates/perry-codegen/src/expr/instance_misc1.rs
• crates/perry-codegen/src/expr/this_super_call.rs
• crates/perry-codegen/src/lower_call/new.rs
• crates/perry-runtime/src/object/class_registry/construct.rs
• crates/perry-runtime/src/object/instanceof.rs
• crates/perry-runtime/src/object/instanceof/static_dispatch.rs
• test-files/test_gap_10639_url_subclass.ts

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[proggeramlug]

Landed on main in merge train 265 (#11108), released as v0.5.1648 at 9d26936298.

Cherry-picked from this PR's head b921d04de7 and validated as one tree with 15 other PRs — CI 22/22 green, all 6 gap-suite shards. A train rebase gives the commits new SHAs, so GitHub cannot auto-close the source PR; closing by hand.

Nothing needed from you. Thanks.