feat: implement futures to better handle async IPC & probes

[encodeous]

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[Copilot]

Pull request overview

This PR introduces a small “Future” abstraction to support non-blocking IPC operations (notably endpoint probing), adds configurable IPC dispatch/probe timeouts, and upgrades probe reporting to include status/latency and DNS resolution details.

Changes:

• Add Future[T] + dispatch-based futures to coordinate async work between IPC handling and the main dispatch loop.
• Extend the IPC probe API to support per-request timeouts and return structured probe results (status, resolved endpoint, latency).
• Add integration + e2e coverage for probe timeout/resolve/latency behavior, and update the nylon probe CLI to accept --timeout.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
state/tunables.go	Adds IPCDispatchTimeout tunable and sets a default.
protocol/nylon_ipc.proto	Extends probe request/response schema (timeout + richer result fields).
protocol/nylon_ipc.pb.go	Regenerated IPC protobuf bindings to reflect schema changes.
integration/ipc_test.go	Adds integration test ensuring probe timeouts are reported.
e2e/probe_test.go	Adds e2e tests for resolved DNS, latency reporting, and error/timeout statuses.
core/nylon_scheduler.go	Adds NewDispatchFuture helper for dispatch-thread async work.
core/nylon_endpoints.go	Refactors probing to return futures and report status/latency/resolution.
core/ipc_handler.go	Reworks IPC probe handling to use futures + timeouts; adds timeout constants.
core/ipc_handler_test.go	Adds unit test for probe timeout calculation/capping.
core/future.go	Introduces Future[T] and AwaitAll.
core/future_test.go	Adds unit tests for future single-consumption, ordering, and timeout.
cmd/probe.go	Adds --timeout flag and prints richer probe output (status/resolved/latency).

Files not reviewed (1)

• protocol/nylon_ipc.pb.go: Generated file

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