Add pnet Connection implementing net.Conn over portals

[KCarretto]

Implements net.Conn over portals by using the stream packet infrastructure, which allows standard net operations like Dial, Read, Write, and Deadlines over Tavern's portal connections.

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PR created automatically by Jules for task 8883179146587030842 started by @KCarretto

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[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
2941	2940	1	0	0	0	1ms

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#1967	❌	2941	2940	1	0	0	0	493272h 55m

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
2941	0	1	7m 8s

Fail Rate

Fail Rate	0.03%

Test 📝	Results 📊	Passed ✅	Failed ❌	Fail Rate (%) 📈
TestMetrics_QuestTimelineChart	1	0	1	100.00    ↑100.00

Failed Tests

Failed Tests
❌ TestMetrics_QuestTimelineChart === RUN TestMetrics_QuestTimelineChart metrics_test.go:101: Error Trace: /home/runner/work/realm/realm/tavern/internal/graphql/metrics_test.go:101 Error: Not equal: expected: 1 actual : 0 Test: TestMetrics_QuestTimelineChart --- FAIL: TestMetrics_QuestTimelineChart (0.02s) Trace: No trace available

Test Changes

0 test added, 0 removed

Slowest Tests

Test 📝	Results 📊	Duration (avg) ⏱️	Duration (p95) ⏱️
eldritch-libfile: std::list_recent_impl::tests::test_list_recent_default_args	3	4m 31s	7m 8s
eldritch-libfile: std::list_recent_impl::tests::test_list_recent_default_args	3	4m 31s	7m 8s
eldritch-libfile: std::list_recent_impl::tests::test_list_recent_default_args	3	4m 31s	7m 8s
TestDockerExecutor_Build_ContextCancellation	1	5.5s	5.5s
eldritch-libsys: std::dll_inject_impl::tests::test_dll_inject_simple	1	5.1s	5.1s
TestInteractiveShell	1	5.1s	5.1s
TestOtherStreamOutput	1	5.0s	5.0s
imix::bin/imix: tests::task_tests::test_task_eprint_behavior	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_eprint_behavior	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_eprint_behavior	3	3.0s	3.0s

_{🍂 No flaky tests in this run.}

Github Test Reporter by CTRF 💚

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