Sync Smith skill during config init

[faustodavid]

Summary

• Add a smith.skill sync helper that links ~/.agents/skills/smith to the bundled skill, preferring Homebrew's stable opt/smith path when available.
• Run skill sync during smith config init and add smith skill sync / smith skill status for existing users.
• Update the Homebrew helper to create a symlink instead of copying the skill, and tighten the formula test to assert that symlink.
• Update README Homebrew instructions to use brew install faustodavid/tap/smith followed by smith config init, with a concise upgrade note.

Validation

• uv run --extra dev pytest tests/unit/test_skill.py tests/contract/test_cli_contracts.py::test_handle_config_init_creates_empty_config_file tests/contract/test_cli_contracts.py::test_handle_config_init_rejects_existing_config_file tests/contract/test_cli_contracts.py::test_handle_skill_sync_reports_current_link tests/unit/test_config.py::test_load_config_rejects_reserved_top_level_remote_names tests/unit/test_onboarding.py::TestValidateRemoteName::test_reserved_name_rejected -q
• uv run --extra dev ruff check src/smith/skill.py src/smith/cli/handlers.py src/smith/cli/parser.py src/smith/formatting.py tests/unit/test_skill.py tests/contract/test_cli_contracts.py tests/unit/test_config.py tests/unit/test_onboarding.py
• temporary-path CLI smoke: smith config init, smith skill status, symlink verification
• JSON smoke: smith config init --format json
• make check
• ruby -c Formula/smith.rb
• brew style ./Formula/smith.rb
• git diff --check
• temp tap audits: brew audit --formula --strict and brew audit --formula --new

Release note

This updates source behavior. The public Homebrew install will get smith config init skill syncing after the next Smith release/tag and tap formula bump. The formula helper change is ready for that bump and still keeps smith-install-skill as a compatibility path.

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