fix(portfolio): classify fable campaign workspaces

[saagpatel]

What

• Classify the three newer Fable campaign control-room folders in the portfolio catalog.
• Keep them in the non-default experiment attention lane instead of surfacing them as operator decisions.

Why

• The latest portfolio truth refresh promoted these packet/output campaign workspaces to decision-needed only because they lacked catalog posture.
• Their local READMEs show they are campaign control rooms, not active product or infrastructure delivery lanes.

How

• Added catalog entries for fable-corpus-campaign, fable-estate-campaign, and fable-rigor-campaign matching the existing Fable campaign pattern.

Testing

• uv run operator-os-seam-linter --truth output/portfolio-truth-latest.json --json passed.
• uv run pytest -q tests/test_portfolio_catalog.py tests/test_portfolio_truth.py passed: 78 tests.
• uv run ruff check . passed.

Risk / Notes

• Low risk; catalog-only posture correction. Local generated portfolio truth showed decision-needed drops to empty after refresh with Notion context preserved.