[P3.8] `httpx.AsyncClient` leaked on every PR-merge webhook dispatch

[frankbria]

Severity: low | Category: correctness | Phase: P3.8

Problem

_dispatch_pr_merged_webhook constructs GitHubIntegration() (eagerly opening an AsyncClient) only to read gh.repo (just os.getenv('GITHUB_REPO')), then discards it without close() — a socket leak per merge.

Evidence

codeframe/ui/routers/pr_v2.py:204

Acceptance criteria

Read GITHUB_REPO from env directly, or try/finally: await gh.close().

Dependencies

None

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_{Filed from the SaaS launch-readiness audit. Atomic: one developer, one session. Work order: strictly P0.1 → P3.12 (no forward dependencies).}

[coderabbitai]

🔗 Related PRs

#582 - fix(pr_v2): close httpx client in all 5 remaining PR endpoints [merged]

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