fix: add validation checks to repo init and support dots in GitHub URLs

[aronchick]

Summary

Fixes two bugs in the multiclaude init command:

1. Better error messages for re-initialization attempts: The init command now checks if a repository is already initialized or if the tmux session already exists before attempting to create them. Previously, users would get cryptic "exit status 1" errors. Now they get clear error messages with actionable suggestions.

2. Support dots in GitHub repository names: The GitHub URL parser now correctly handles repository names containing dots (e.g., demos.expanso.io). The regex was too restrictive and excluded dots from repo names, causing fork detection to fail.

Changes

• internal/cli/cli.go:1083-1110: Add pre-flight validation checks in initRepo()
  • Check if repo already exists in state before cloning
  • Check if repository directory already exists
  • Check if tmux session exists before creating it
• internal/fork/fork.go:107-115: Update regex in ParseGitHubURL() to allow dots in repository names
  • Changed from [^/.]+ to [^/]+? to allow any characters except slashes
• internal/fork/api_test.go:308-314: Update test case to reflect dots are now supported

Test Plan

• All existing tests pass: go test ./...
• Fork URL parsing test updated and passing
• Verified error message when attempting to re-init existing repo
• Verified fork detection now works with demos.expanso.io

Related Issues

Fixes the bug reported where multiclaude init https://github.com/expanso-io/demos.expanso.io demos-expanso-io failed with:

• Warning: unable to parse GitHub URL: https://github.com/expanso-io/demos.expanso.io
• Error: tmux create session failed: exit status 1

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