fix(endpoint): repair active user runtime config after installs

[shukieshah]

Summary

• Add a hidden system endpoint helper that repairs the active console user's native Claude/Codex/Gemini OTLP config and refreshes supported user hooks.
• Run that helper from macOS package postinstall so package updates do not write user runtime config as root only.
• Make endpoint repair tolerate transient collector port handoff delays before reporting a real local OTLP port conflict.

Test plan

• cd cli/beacon && go test ./internal/endpoint/collector ./internal/endpoint/lifecycle ./internal/endpoint/hooks ./cmd
• sh packaging/macos/test-endpoint-scripts.sh

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