Fix ingest-claude-code path decoding and deduplicate constants

[Copilot]

Addresses review feedback on ingest-claude-code tool and add-go-project skill documentation.

Fixes

• Path decoding: Fixed project path conversion that incorrectly replaced all hyphens with slashes. Now properly handles the Claude trace format (e.g., -Users-artyom-code-neongreen-mono) by removing only the leading hyphen and using filepath.Join() for cross-platform compatibility.

• Constant deduplication: Extracted maxScannerCapacity (10MB buffer for large trace lines) to shared constants.go.

• Documentation clarity: Clarified in SKILL.md that new projects must use full module paths (e.g., github.com/neongreen/mono/my-tool), noting existing short names are historical.

• Integration: Added ingest-claude-code to go-projects.toml.

Path decoding change

// Before: breaks "my-project" → "my/project"
session.ProjectPath = strings.ReplaceAll(dirName, "-", "/")

// After: handles "-Users-artyom-code-mono" → "Users/artyom/code/mono"
if strings.HasPrefix(decoded, "-") {
    decoded = decoded[1:]
}
segments := strings.Split(decoded, "-")
session.ProjectPath = filepath.Join(segments...)

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