Resolve SSH host aliases in git remote URLs

[svarlamov]

Summary

• Parse ~/.ssh/config to resolve SSH Host aliases to their HostName values when normalizing git remote URLs
• Fixes telemetry/metrics reporting incorrect domains when repos use SSH profiles (e.g., git@github-work:org/repo now correctly resolves to github.com)
• Always attempts resolution for any SSH-style URL — SSH aliases can be anything, including dotted hostnames

Changes

• New src/ssh_config.rs: Lightweight SSH config parser (Host→HostName extraction, wildcard/Match block handling, case-insensitive keywords, = separator support)
• src/repo_url.rs: normalize_repo_url() resolves SSH hosts via config for both scp-like and ssh:// URLs
• src/authorship/git_ai_hooks.rs: Hook context now normalizes remote URLs (resolving aliases + canonicalizing)
• 5 integration tests using TestRepo with isolated HOME/SSH config per test

Test plan

• 15 unit tests for SSH config parser
• 15 existing repo_url unit tests pass (no regression)
• 5 new TestRepo-based e2e tests: alias resolution, no-config fallback, no-match fallback, dotted alias, multi-alias Host lines
• 4 existing git_ai_hooks integration tests pass (no regression)
• CI passes

🤖 Generated with Claude Code

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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