fix(ocap-kernel): count remote and terminated importers in getImporters

[sirtimid]

retireKernelObjects deletes a kernel object once every importer from getImporters has a retireImport queued. getImporters only read vatConfig rows, so it missed remotes and terminated vats whose c-list cleanup had not run yet. Those importers kept c-list entries for deleted krefs, which the refcount audit reports as dangling.

getImporters now returns the union of vat IDs, terminated vats and remote IDs, deduplicated, as EndpointId[].

• New getRemoteIDs on the kernel store.
• importsKernelSlot takes an EndpointId.

Merge order: land after #1099. This PR queues retireImports to remotes, and on main a GC action for a remote with no handle, which is every remote until initRemoteComms, still kills the run loop at boot. #1099 holds those back.

Testing

• gc.test.ts: a remote importer alongside a vat importer, and a terminated vat whose c-list outlived its config.
• remote.test.ts: getRemoteIDs.

Fixes #1015

🤖 Generated with Claude Code

---

Note

Medium Risk
Changes kernel GC importer discovery, which affects when objects are deleted and which endpoints receive retireImport; should land with the run-loop fix that tolerates GC to inactive endpoints (#1098).

Overview
Fixes incomplete retireImport notifications when kernel objects are collected by widening getImporters so it no longer scans only active vat configs.

getImporters now deduplicates across live vat IDs, terminated vats whose c-lists still exist, and remote IDs (via new store helper getRemoteIDs), and treats importers as generic **EndpointId**s. retireKernelObjects therefore queues retireImport for remote peers and not-yet-cleaned terminated vats as well, avoiding c-list entries that point at deleted krefs and refcount-audit failures.

Changelog documents the fix and the new getRemoteIDs API; tests cover remote importers, terminated-vat importers, and remote ID listing.

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	73.58% ⬆️ +0.22%	10202 / 13864
🔵	Statements	73.34% ⬆️ +0.22%	10340 / 14098
🔵	Functions	73.52% ⬆️ +0.21%	2385 / 3244
🔵	Branches	68.41% ⬆️ +0.35%	4247 / 6208

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/ocap-kernel/src/store/methods/gc.ts	97.56% ⬆️ +6.10%	88.88% ⬆️ +3.70%	100% 🟰 ±0%	97.56% ⬆️ +6.10%	163, 175
packages/ocap-kernel/src/store/methods/remote.ts	98.48% ⬆️ +0.05%	100% 🟰 ±0%	100% 🟰 ±0%	98.48% ⬆️ +0.05%	105-109
packages/ocap-kernel/src/store/methods/vat.ts	98.52% ⬆️ +0.01%	90% 🟰 ±0%	100% 🟰 ±0%	98.51% ⬆️ +0.01%	325-326

Generated in workflow #5207 for commit 5b286f5 by the Vitest Coverage Report Action