docs: mark PORTFOLIO-002 and PORTFOLIO-003 done, update roadmap

docs/roadmap/done/PORTFOLIO-002-position-storage-costs.yaml

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+id: PORTFOLIO-002
+title: Position Storage Costs
+status: backlog
+priority: P1
+size: S
+depends_on:
+  - PORTFOLIO-001
+tags: [portfolio, costs]
+summary: Allow users to configure storage costs for portfolio positions.
+acceptance_criteria:
+  - Each position can have optional storage_cost_basis (annual % or fixed amount)
+  - Storage cost period selectable: annual, monthly
+  - Overview page shows aggregate storage cost impact on net equity
+  - Hedge recommendations account for storage drag
+  - Physical gold positions default to typical vault storage (e.g., 0.12% annual for allocated)
+  - GLD positions note that expense ratio is already baked into price
+notes:
+  - For GLD: expense ratio decay is implicit, no separate storage cost needed
+  - For GC=F: roll costs (contango) are the primary storage analog
+  - For physical XAU: vault storage is explicit cost
+  - Storage costs affect LTV calculations (reduce effective equity)
+implementation_hints:
+  - Add `storage_cost_basis: Decimal | None` to `Position`
+  - Add `storage_cost_period: "annual" | "monthly" | None` to `Position`
+  - Compute annualized storage cost for equity/P&L display
+  - Add storage cost breakdown to overview page