Expand model tag support: add GLM-5.1, simplify Anthropic IDs, scan tags anywhere in message

- Flink update_bars debouncing
- update_bars subscription idempotency bugfix
- Price decimal correction bugfix of previous commit
- Add GLM-5.1 model tag alongside renamed GLM-5
- Use short Anthropic model IDs (sonnet/haiku/opus) instead of full version strings
- Allow @tags anywhere in message content, not just at start
- Return hasOtherContent flag instead of trimmed rest string
- Only trigger greeting stream when tag has no other content
- Update workspace knowledge base references to platform/workspace and platform/shapes
- Hierarchical knowledge base catalog
- 151 Trading Strategies knowledge base articles
- Shapes knowledge base article
- MutateShapes tool instead of workspace patch

gateway/knowledge/trading/strategies/fixed-income/carry-factor.md

@@ -0,0 +1,56 @@
+---
+description: "The carry factor strategy buys bonds with the highest carry — the return earned as a bond rolls down the yield curve — combining bond yield income with the roll-down return from the yield curve's slope."
+tags: [fixed-income, factor, carry, roll-down, yield-curve]
+---
+
+# Carry Factor
+
+**Section**: 5.11 | **Asset Class**: Fixed Income | **Type**: Factor / Carry
+
+## Overview
+Carry in fixed income is the return from holding a bond as it "rolls down" the yield curve toward maturity. If the term structure is upward-sloping and stable, a bond's yield declines as its maturity shortens, causing a price appreciation on top of the coupon income. The carry factor strategy buys bonds in the top decile by carry and sells those in the bottom decile.
+
+## Construction / Mechanics
+
+**Carry** over horizon Δt for a bond with current maturity T:
+
+```
+C(t, t+Δt, T) = [P(t+Δt, T) - P(t, T)] / P(t, T)                  (413)
+```
+
+Under the assumption that the yield curve shape is constant (R(t,T) = f(T-t) only), the yield at t+Δt is R(t+Δt, T) = R(t, T-Δt), giving:
+
+```
+C(t, t+Δt, T) = R(t,T)·Δt + C_roll(t, t+Δt, T)                    (414)
+```
+
+Two components:
+1. **Yield income**: R(t,T)·Δt — the bond's current yield times the holding period
+2. **Roll-down return**:
+```
+C_roll(t, t+Δt, T) ≈ -ModD(t,T) · [R(t, T-Δt) - R(t, T)]          (415)
+```
+This is the price appreciation as the bond shortens in maturity by Δt along a static yield curve, estimated using modified duration.
+
+**Portfolio construction**: rank all bonds by C(t, t+Δt, T); long top decile, short bottom decile (zero-cost version).
+
+## Payoff / Return Profile
+- Earns yield income plus roll-down return when the yield curve is upward-sloping and stable.
+- Roll-down return is greatest in the steepest segments of the yield curve.
+- Underperforms or loses when the yield curve flattens, inverts, or shifts upward unexpectedly.
+
+## Key Parameters / Signals
+- R(t,T): current yield (income component)
+- ModD(t,T): modified duration (scales the roll-down component)
+- R(t, T-Δt) - R(t, T): slope of the yield curve at maturity T (steeper = more roll-down)
+- Δt: carry horizon (e.g., 1 month)
+
+## Variations
+- Long-only: buy top decile by carry (no short sales required).
+- Cross-asset carry: extend the same framework to other fixed income markets (government bonds, credit, etc.).
+
+## Notes
+- The static yield curve assumption simplifies computation; actual carry will differ if the curve shifts.
+- For financed portfolios, R(t,T) is replaced by R(t,T) - r_f (excess yield over the risk-free rate) in the income component, but this does not affect portfolio weights.
+- High-carry bonds tend to have longer maturities in an upward-sloping curve environment, so the carry factor has implicit duration exposure.
+- Carry and roll-down are sometimes separated as distinct signals; roll-down alone favors bonds in the steepest curve segments regardless of yield level.