feat(proxy): emit session summary on persistent proxy shutdown

[Sahilb315]

Why

The persistent proxy daemon (server mode) never runs the per-invocation flow that calls LogSessionComplete, so no session summary ever reached SafeDep Cloud for server-mode runs. Per-package events synced, but the per-run aggregate (and the CI/invocation context it carries) was missing.

What

• Emit a session summary from the daemon on shutdown, built from the aggregate stats collector it already maintains. It's emitted after the request drain and before the final cloud flush, so it's delivered alongside the run's other events. Because it's a session-complete event, cloudSink automatically attaches the CI/invocation context.
• Extract the event emission out of LogSessionComplete into a shared exported LogSessionSummary(SessionData). The per-invocation flow (which sources data from the audit session) and the daemon (which sources from the stats collector) now share one emit path — no duplicated event construction.
• The daemon serves every package manager, so the summary carries no single package manager (maps to UNSPECIFIED); outcome is blocked when anything was blocked, else success; duration is the daemon lifetime.

Notes

• TrustedSkipped / InsecureBypassed are 0 in server mode — the stats collector doesn't track them yet. Can be added via new Record* methods if needed.
• Includes a small unrelated tweak: shorten the action's default cloud endpoint id prefix github-actions/ → gha/.

[safedep]

SafeDep Report Summary

No dependency changes detected. Nothing to scan.

View complete scan results →

_{This report is generated by SafeDep Github App}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 48.88889% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.04%. Comparing base (c47776d) to head (9b2620c).

Files with missing lines	Patch %	Lines
internal/proxyserver/server.go	0.00%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #352      +/-   ##
==========================================
- Coverage   54.10%   54.04%   -0.07%     
==========================================
  Files         205      205              
  Lines       13937    13961      +24     
==========================================
+ Hits         7541     7545       +4     
- Misses       5697     5717      +20     
  Partials      699      699              

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.