runtime: native-payload lifecycle — close releases, sweep finalizes, same-cell reopen, terminal events

[proggeramlug]

Refs #11919. Separates CLOSED (resource released, cell alive, owner still traced) from FINALIZED (sweep/teardown). Adds same-cell reopen (attach), an OpenSerial for stale children, link_event_owner for terminal events after close, and alloc_closed; finish() returns CallEnd::{Threw, Closed}. Cell size and hot paths are unchanged. Unblocks the sqlite (reopen) and net (terminal events after destroy) conversions. Tests: runtime 5020/0, stdlib 247/0, codegen 2510/0; T1–T12 plus L4/L5/L8/L9 with 18/18 sabotages red; 200k churn created = finalized = drops.

Draft until the merged-tree check is done.

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Reviewing files that changed from the base of the PR and between 130156d and b49a915.

📒 Files selected for processing (12)

• changelog.d/PENDING-native-payload-lifecycle.md
• crates/perry-runtime/src/gc/layout_slot_visit.rs
• crates/perry-runtime/src/gc/malloc.rs
• crates/perry-runtime/src/gc/tests/copying/latch.rs
• crates/perry-runtime/src/gc/tests/native_payload_callbacks.rs
• crates/perry-runtime/src/gc/tests/native_payload_lifecycle.rs
• crates/perry-runtime/src/native_handle.rs
• crates/perry-runtime/src/native_payload.rs
• crates/perry-stdlib/src/runtime_thread_exit_tests/symbols_tests.rs
• crates/perry-stdlib/src/streams/tests.rs
• docs/native-payload-lifecycle-validation.md
• docs/native-payload-pattern.md

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