test(bpf): integration-test eBPF load and event flow (#148)

[Anushreer22]

Adds an integration test that loads the syscall and TCP BPF programs and verifies collectors receive events from synthetic activity.

Changes

• internal/integration/ebpf_load_test.go — new integration test using testcontainers

How it works

• Loads syscall latency and TCP monitor BPF programs (skips if BTF unavailable)
• Generates syscall activity via an Alpine container running file operations
• Makes a localhost TCP connection to trigger the TCP collector
• Asserts that at least the syscall collector captured events
• Gracefully skips if BPF programs cannot be loaded

Closes #148

[github-actions]

🚀 First PR — welcome aboard!

A few things to expect:

1. CI: every PR runs build + race tests + lint + (eventually) the kernel matrix. If something fails, the log will tell you exactly which gate.
2. DCO: every commit needs Signed-off-by: — git commit -s adds it automatically.
3. Conventional Commits: PR titles like feat(doctor): add new rule or fix(bpf): handle X. We squash-merge by default.
4. Review: a maintainer will review within 72 hours. Suggestions are conversations, not orders — push back if something doesn't fit your context.

If you get stuck, reply here or jump to Discussions. We want this PR to land.