feat(cuinterpose): process identity and peer export service

[galletas1712]

Summary

Refs #295 (approved).

Create each process's identity and control socket, serve peer export FDs, and queue coordinator operations on the control thread.

Review boundary

Peer export requests use the descriptor cache without taking the main CUDA-state lock. Coordinator operations run separately. Keep the existing simple fork reset; no PageBroker descriptor handoff.

Use Condvar::wait_while for ordinary export-cache retirement and drain waits. Keep the fork-time loop explicit so poisoned-lock recovery continues rechecking outstanding transfers.

Stack and compatibility

The stack starts directly on main; it does not depend on the PageBroker GPU-transfer branch or #323. The shim only saves shared creator bytes through host carriers. Never-shared allocations remain native CUDA state. The stack removes launch-job/jobfile support, and older jobfile-dependent or draft shim artifacts are rejected rather than migrated.

PageBroker and native CustomStorage changes are separate. No PR in this stack adds that implementation.

Order	PR	Scope
1	#326	C preload frontend and private ABI
2	#327	typed identities and peer transport
3	#328	process identity and peer export service
4	#329	VMM ownership and allocation lifecycle
5	#342	implement CUDA memory IPC over tracked VMM
6	#330	host-carrier storage for shared allocation bytes
7	#331	multicast tracking and reconstruction
8	#332	Rust lifecycle coordinator
9	#333	package frontend, Rust backend, and coordinator
10	#334	deliver CUDA tools and enable opt-in preload
11	#335	coordinate cuinterpose capture and restore without jobfiles
12	#336	deliver CUDA tools without rewriting workload commands
13	#337	explain host carriers, memory IPC, and restore ordering
14	#338	unit, integration, and GPU lifecycle coverage

Validation

Validation of the assembled implementation:

• Full API, agent, and operator Go tests; key agent race tests.
• Rust workspace tests, strict Clippy, GNU/musl builds, ABI/ELF checks, packaged frontend/fake-driver tests, and memory-IPC regressions.
• Helm tests/lint, Python manifest/report tests, repository lint, and make check in a clean disposable worktree.
• A small real-agent CRIU cross-node test passed on two GPU nodes, covering memory IPC, private/shared VMM, multicast/graph replay, bytes, and original addresses. It preceded only the final manifest-format guard; that guard has local regression coverage.

GLM testing without CustomStorage was cancelled at the user's request and is not a pass. GLM qualification uses a separate composition with CustomStorage; previous experimental GLM results are not qualification of this rebuilt stack. The installed test driver is not claimed to be a stock-driver qualification.

Tests above were run on the assembled implementation, not claimed independently for every source-only intermediate PR. The standard-library cleanup was validated with Rust workspace tests and strict Clippy, GNU/musl builds and packaged fake-driver tests, plus targeted pod-contract and CUDA-agent Go tests. Physical-GPU tests were not rerun for this cleanup; the earlier GPU results above remain attributed to the pre-cleanup implementation.

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