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/options/short-combo.md

@@ -0,0 +1,36 @@
+---
+description: "A bearish capital-gain strategy (short risk reversal) buying an OTM put at K1 and selling an OTM call at K2 > K1, profiting from a strong downward move."
+tags: [options, speculation, bearish, risk-reversal]
+---
+
+# Short Combo
+
+**Section**: 2.13 | **Asset Class**: Options | **Type**: Speculation
+
+## Overview
+The short combo (a.k.a. "short risk reversal") amounts to buying an OTM put option with strike K1 and selling an OTM call option with strike K2, where K2 > K1. The trader's outlook is bearish. This is a capital gain strategy.
+
+## Construction
+- Buy 1 OTM put option at strike K1
+- Sell 1 OTM call option at strike K2 (K2 > K1), same expiry
+
+Net debit or credit H (H = D if net debit, H = -C if net credit; K2 > K1)
+
+## Payoff Profile
+f_T = (K1 - S_T)+ - (S_T - K2)+ - H
+
+Breakeven depends on sign of H:
+- S* = K1 - H  (if H > 0, net debit)
+- S* = K2 - H  (if H < 0, net credit)
+- K1 <= S* <= K2  (if H = 0, zero-cost)
+
+- Max profit: P_max = K1 - H  (if stock goes to zero)
+- Max loss: L_max = unlimited  (stock can rise without bound)
+
+## Key Conditions / Signals
+- Strongly bearish outlook
+- Traders often structure as zero-cost (H = 0) by selecting K1 and K2 such that premiums offset
+- Profits from a large downward move; loses if stock rises above K2
+
+## Notes
+The short combo creates a flat zone [K1, K2] where the payoff equals -H. Unlike the short synthetic forward (where K1 = K2 = S0), both strikes are OTM. Unlimited loss potential on the upside due to the short call.