fix: Kraiken.sol and Stake.sol absent from agent context across all runs (#829)

Inject Kraiken.sol (outstandingSupply, mint/burn mechanics) and Stake.sol
(snatch, withdrawal, KRK exclusion from floor denominator) into the red-team
agent prompt so agents can reason from actual source rather than guesses.

- red-team.sh: read SOL_KRAIKEN and SOL_STAKE from onchain/src/ alongside
  the other six contracts already injected
- red-team-program.md: add ### Kraiken.sol and ### Stake.sol sections in the
  Source Code reference block (after PriceOracle.sol)
- AGENTS.md: document the full list of injected contracts in a new
  "Red-team Agent Context" section; both files are now listed as in-scope

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/harb-evaluator/red-team-program.md

@@ -135,6 +135,16 @@ Do NOT attempt to deploy or modify contracts — these are for reference only.
 {{SOL_PRICE_ORACLE}}
 ```
 
+### Kraiken.sol
+```solidity
+{{SOL_KRAIKEN}}
+```
+
+### Stake.sol
+```solidity
+{{SOL_STAKE}}
+```
+
 ---
 
 ## Cast command patterns