fix: render an empty dashboard when no projects exist

[Mike-7777777]

What changes

python src/generate_project_dashboard.py --all now generates the existing overview with 0 projects when data/projects/ does not exist. It does not create an unused projects directory.

Why

A fresh checkout has no projects directory. Unconditionally iterating over that path raised FileNotFoundError before the existing empty-overview renderer could run. The fix handles the missing directory at the enumeration boundary. A non-directory path still raises an error, and --only still rejects unknown project names.

Validation

• Added four regression cases covering missing and empty project directories, an unknown filter with no projects directory, and a projects path that is a regular file. The two missing-directory cases failed before the fix; all four now pass.
• Ran the documented command on a checkout with no projects directory: it exits successfully and reports 0 projects. Inspected the generated page in a browser and confirmed its empty overview renders correctly.
• The full offline Python suite, Ruff, compilation, model-reference checks, configuration projection, secret scan, release-tree check, and public-knowledge check pass locally.
• Code review found no actionable defects. No model credentials or paid calls were needed.

Scope check

• One issue and one independently reviewable change.
• Existing populated-project, filtering, and path-boundary tests remain green.
• No unrelated changes, generated pages, or credentials are committed.
• Checked open PRs before implementation; no overlapping PR was present.

Fixes #2

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