[Repo Assist] refactor(proxy): replace private truncateForLog with strutil.Truncate

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Summary

internal/proxy/handler.go contained a private truncateForLog helper that duplicates the behaviour of strutil.Truncate, which already exists as a shared utility used by internal/logger/rpc_helpers.go and internal/auth/header.go.

Changes

• internal/proxy/handler.go:
  • Add import for github.com/github/gh-aw-mcpg/internal/strutil
  • Replace the single call to truncateForLog(string(graphQLBody), 500) with strutil.Truncate(string(graphQLBody), 500)
  • Remove the now-unused truncateForLog function (6 lines)

Rationale

The removed function was semantically identical to strutil.Truncate:

// Before (private copy in handler.go)
func truncateForLog(s string, maxLen int) string {
    if len(s) <= maxLen { return s }
    return s[:maxLen] + "..."
}

// After (shared utility — same behaviour)
strutil.Truncate(s, maxLen)  // returns s[:maxLen]+"..." if len(s) > maxLen

Using the shared utility:

• Eliminates a redundant private implementation
• Is consistent with the rest of the codebase (logger/rpc_helpers.go, auth/header.go both use strutil.Truncate)
• Has no behaviour change — the semantics are identical

Test Status

• gofmt -l internal/proxy/handler.go reports no formatting issues (file is clean)
• Build requires Go 1.25 which cannot be downloaded in this sandboxed environment (firewall blocks proxy.golang.org). Code was verified syntactically via gofmt -e and logic-reviewed manually.
• No test changes required — truncateForLog had no direct unit test, and the call site behaviour is unchanged.

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