docs: document Prop 121 disabling outbound IBC, remove dead bridge-out routes and IBC remnants - #51

Running Vale across on the following files affected by this PR:

- cosmos-sdk/index.mdx
- evm/differences-with-ethereum.mdx
- evm/precompiles/cosmwasm-precompiles/bank.mdx
- evm/precompiles/cosmwasm-precompiles/cosmwasm.mdx
- evm/precompiles/cosmwasm-precompiles/example-usage.mdx
- index.mdx
- learn/dev-interoperability.mdx
- learn/sip-03-exchange-migration.mdx
- learn/sip-03-migration.mdx
- node/node-operators.mdx
- skill.md

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evm/differences-with-ethereum.mdx:
	- 53:4     Use sentence case for headings: 'Sei EVM Release'.
	- 69:4     Use sentence case for headings: 'Opcode Differences'.
	- 83:5     Use sentence case for headings: 'PREVRANDAO'.
	- 97:4     Use sentence case for headings: 'State Root'.
	- 104:4    Use sentence case for headings: 'Block Hash'.
	- 109:4    Use sentence case for headings: 'Base Fee & Tips'.
	- 134:4    Use sentence case for headings: 'Non-EVM Transactions'.
	- 148:4    Use sentence case for headings: 'Pending State'.
	- 159:4    Use sentence case for headings: 'Gas Model & Fees'.
	- 181:4    Use sentence case for headings: 'SSTORE Gas Cost'.
	- 195:4    Use sentence case for headings: 'ERC Token Standards Compatibility'.
	- 205:4    Use sentence case for headings: 'Testing & Migration Checklist'.

evm/index.mdx:
	- 8:4     Use sentence case for headings: 'Why Choose Sei EVM?'.
	- 22:4    Use sentence case for headings: 'Quick Start'.
	- 39:4    Use sentence case for headings: 'Ready-to-Deploy Examples'.
	- 53:4    Use sentence case for headings: 'Development Tools'.
	- 67:4    Use sentence case for headings: 'Use Cases'.
	- 78:4    Use sentence case for headings: 'RPC Endpoints'.

evm/precompiles/cosmwasm-precompiles/bank.mdx:
	- 13:4      Use sentence case for headings: 'How Does the Bank Precompile Work?'.
	- 23:4      Use sentence case for headings: 'Use Cases'.
	- 29:4      Use sentence case for headings: 'What You'll Learn in This Guide'.
	- 41:5      Use sentence case for headings: 'Transaction Functions'.
	- 67:5      Use sentence case for headings: 'Query Functions'.
	- 115:4     Use sentence case for headings: 'Using the Precompile'.
	- 129:6     Use sentence case for headings: 'Install Dependencies'.
	- 144:6     Use sentence case for headings: 'Setup Hardhat Environment'.
	- 172:6     Use sentence case for headings: 'Import Precompile Components'.
	- 266:5     Use sentence case for headings: 'Native SEI vs Custom Tokens'.
	- 280:4     Use sentence case for headings: 'Step-by-Step Guide: Using the Bank Precompile'.
	- 282:5     Use sentence case for headings: 'Send Native SEI Tokens'.
	- 333:5     Use sentence case for headings: 'Send Custom Tokens'.
	- 410:5     Use sentence case for headings: 'Query Account Balance'.
	- 467:5     Use sentence case for headings: 'Query All Balances'.
	- 542:5     Use sentence case for headings: 'Query Token Metadata'.
	- 625:5     Use sentence case for headings: 'Complete Integration Example'.
	- 1106:4    Use sentence case for headings: 'Security Considerations & Risks'.
	- 1108:5    Use sentence case for headings: 'Transaction Security'.
	- 1114:5    Use sentence case for headings: 'Permission Management'.
	- 1132:5    Use sentence case for headings: 'Common Issues and Solutions'.
	- 1134:6    Use sentence case for headings: 'Transaction Failures'.
	- 1152:6    Use sentence case for headings: 'Balance Query Issues'.
	- 1169:5    Use sentence case for headings: 'Error Code Reference'.
	- 1180:4    Use sentence case for headings: 'Important Notes'.
	- 1192:5    Use sentence case for headings: 'Gas Optimization'.
	- 1198:5    Use sentence case for headings: 'Integration Best Practices'.

evm/precompiles/cosmwasm-precompiles/cosmwasm.mdx:
	- 23:4     Use sentence case for headings: 'How Does the CosmWasm Precompile Work?'.
	- 31:4     Use sentence case for headings: 'What You'll Learn in This Guide'.
	- 44:5     Use sentence case for headings: 'Transaction Functions'.
	- 74:5     Use sentence case for headings: 'Query Functions'.
	- 87:4     Use sentence case for headings: 'Using the Precompile'.
	- 100:6    Use sentence case for headings: 'Install Dependencies'.
	- 112:6    Use sentence case for headings: 'Import Precompile Components'.
	- 137:4    Use sentence case for headings: 'Critical: Understanding Message Formats'.
	- 141:5    Use sentence case for headings: 'CosmWasm Message Structure'.
	- 151:5    Use sentence case for headings: 'How Message Encoding Works'.
	- 163:5    Use sentence case for headings: 'Best Practice: Message Encoding Helpers'.
	- 206:4    Use sentence case for headings: 'Message Format Helpers'.
	- 254:4    Use sentence case for headings: 'Step-by-Step Guide: Using the CosmWasm Precompile'.
	- 256:5    Use sentence case for headings: 'Execute a CosmWasm Contract'.
	- 314:5    Use sentence case for headings: 'Execute Batch Operations'.
	- 385:5    Use sentence case for headings: 'Query a CosmWasm Contract'.
	- 454:4    Use sentence case for headings: 'Advanced Usage Examples'.
	- 456:5    Use sentence case for headings: 'Cross-Runtime DeFi Integration'.
	- 495:5    Use sentence case for headings: 'Complete Integration Example'.
	- 733:5    Use sentence case for headings: 'Common Issues and Solutions'.
	- 735:6    Use sentence case for headings: 'Message Encoding Issues'.
	- 753:5    Use sentence case for headings: 'Error Code Reference'.
	- 764:4    Use sentence case for headings: 'Important Notes'.
	- 768:5    Use sentence case for headings: 'Message Format Requirements'.
	- 774:5    Use sentence case for headings: 'Contract Address Format'.
	- 780:5    Use sentence case for headings: 'Cross-Runtime Considerations'.
	- 788:5    Use sentence case for headings: 'Best Practices'.

evm/precompiles/cosmwasm-precompiles/example-usage.mdx:
	- 50:6    Use sentence case for headings: 'Querying & Executing a CosmWasm Contract'.

evm/sei-js/index.mdx:
	- 19:4     Use sentence case for headings: 'Package Ecosystem'.
	- 37:6     Use sentence case for headings: '@sei-js/sei-global-wallet'.
	- 45:6     Use sentence case for headings: '@sei-js/ledger'.
	- 69:4     Use sentence case for headings: 'Quick Start'.
	- 125:4    Use sentence case for headings: 'Community & Support'.

evm/tracing/index.mdx:
	- 21:4     Use sentence case for headings: 'What You Can Trace'.
	- 23:5     Use sentence case for headings: 'Transaction Execution'.
	- 37:5     Use sentence case for headings: 'Performance Analysis'.
	- 44:5     Use sentence case for headings: 'Security Analysis'.
	- 51:4     Use sentence case for headings: 'Available Tracing Methods'.
	- 60:4     Use sentence case for headings: 'Transaction Analysis Example'.
	- 270:4    Use sentence case for headings: 'Debugging Failed Transactions'.
	- 290:5    Use sentence case for headings: 'Step 2: Trace the Execution'.
	- 334:5    Use sentence case for headings: 'Step 3: Fix and Test'.
	- 365:4    Use sentence case for headings: 'Common Debugging Scenarios'.
	- 367:5    Use sentence case for headings: 'Transaction Reverted'.
	- 372:5    Use sentence case for headings: 'Out of Gas'.
	- 377:5    Use sentence case for headings: 'Unexpected Behavior'.
	- 382:5    Use sentence case for headings: 'Slow Performance'.
	- 387:4    Use sentence case for headings: 'Quick Reference'.
	- 389:5    Use sentence case for headings: 'Essential Commands'.
	- 405:5    Use sentence case for headings: 'Common Tracers'.
	- 411:4    Use sentence case for headings: 'Next Steps'.

index.mdx:
	- 21:4     Use sentence case for headings: 'Quick Start'.
	- 41:4     Use sentence case for headings: 'Essential Resources'.
	- 130:4    Use sentence case for headings: 'Smart Contracts'.
	- 143:4    Use sentence case for headings: 'Infrastructure & Tools'.

learn/dev-interoperability.mdx:
	- 12:4    Use sentence case for headings: 'Dual Address Support'.
	- 26:4    Use sentence case for headings: 'Virtual Machine Interoperability'.
	- 38:4    Use sentence case for headings: 'Precompile Contracts'.
	- 46:4    Use sentence case for headings: 'Example Diagram'.

learn/index.mdx:
	- 12:4     Use sentence case for headings: 'Understand the Sei Ecosystem'.
	- 48:4     Use sentence case for headings: 'MCP Server: AI-Powered Blockchain'.
	- 78:4     Use sentence case for headings: 'Sei EVM Platform Details'.
	- 80:5     Use sentence case for headings: 'Traditional EVM Constraints Solved by Sei'.
	- 94:5     Use sentence case for headings: 'Core System Architecture'.
	- 111:5    Use sentence case for headings: 'Performance Advantages'.
	- 131:4    Use sentence case for headings: 'Sei Giga: Next-Generation Architecture'.
	- 153:4    Use sentence case for headings: 'Key Use Cases'.

learn/sip-03-exchange-migration.mdx:
	- 33:6    Use sentence case for headings: '2) Automated forwarding contract'.
	- 39:6    Use sentence case for headings: '3) User-directed forwarding contract'.
	- 45:6    Use sentence case for headings: '4) Fully manual transfer'.
	- 59:5    Use sentence case for headings: 'FundsForwarder contract'.

learn/sip-03-migration.mdx:
	- 112:5    Use sentence case for headings: '1) Asset Transfer (Native ↔ EVM)'.
	- 121:5    Use sentence case for headings: '2) USDC on Sei'.
	- 144:5    Use sentence case for headings: '3) Address Association (Seistream)'.
	- 224:4    Use sentence case for headings: 'FAQ'.
	- 264:5    Use sentence case for headings: 'I hold USDC.n (USDC via Noble) — what should I do?'.

llms/skill.md:
	- 112:5    Use sentence case for headings: 'get_chain_status'.
	- 130:5    Use sentence case for headings: 'get_account_balance'.
	- 149:5    Use sentence case for headings: 'get_evm_address'.
	- 165:5    Use sentence case for headings: 'get_sei_address'.
	- 181:5    Use sentence case for headings: 'get_transaction'.
	- 200:5    Use sentence case for headings: 'get_block'.
	- 218:5    Use sentence case for headings: 'get_gas_price'.
	- 234:5    Use sentence case for headings: 'get_contract_state'.
	- 251:5    Use sentence case for headings: 'send_tokens'.
	- 276:5    Use sentence case for headings: 'execute_contract'.
	- 302:5    Use sentence case for headings: 'deploy_contract'.
	- 322:5    Use sentence case for headings: 'stake_tokens'.
	- 341:5    Use sentence case for headings: 'unstake_tokens'.
	- 360:5    Use sentence case for headings: 'estimate_transaction_cost'.
	- 378:5    Use sentence case for headings: 'simulate_contract_execution'.
	- 397:5    Use sentence case for headings: 'get_portfolio_summary'.
	- 414:5    Use sentence case for headings: 'monitor_transaction'.

node/index.mdx:
	- 22:4     Use sentence case for headings: 'Network Versions'.
	- 28:4     Use sentence case for headings: 'Hardware Requirements'.
	- 37:4     Use sentence case for headings: 'Installation & Setup Steps'.
	- 50:8     Use sentence case for headings: '2. Install Essential Packages'.
	- 56:8     Use sentence case for headings: '3. Synchronize System Time'.
	- 64:7     Use sentence case for headings: 'Install Go'.
	- 68:8     Use sentence case for headings: 'Installation Steps'.
	- 132:7    Use sentence case for headings: 'Initialize Chain Files'.
	- 160:7    Use sentence case for headings: 'Configure App Settings'.
	- 190:6    Use sentence case for headings: 'Archive Node Setup'.
	- 204:6    Use sentence case for headings: 'Mempool Configuration'.
	- 292:7    Use sentence case for headings: 'Monitoring & Troubleshooting'.
	- 328:4    Use sentence case for headings: 'Node Resources'.
	- 330:5    Use sentence case for headings: 'Node Setup'.
	- 344:5    Use sentence case for headings: 'Advanced Operations'.

node/node-operators.mdx:
	- 12:4      Use sentence case for headings: 'Configuration Management'.
	- 14:5      Use sentence case for headings: 'Directory Structure'.
	- 34:5      Use sentence case for headings: 'Essential Configuration Parameters'.
	- 36:6      Use sentence case for headings: 'Network Settings (config.toml)'.
	- 62:6      Use sentence case for headings: 'Application Settings (app.toml)'.
	- 100:5     Use sentence case for headings: 'Default Configurations'.
	- 1367:4    Use sentence case for headings: 'Database Management'.
	- 1392:5    Use sentence case for headings: 'SeiDB Configuration'.
	- 1466:5    Use sentence case for headings: 'Giga Storage and Giga Executor'.
	- 1510:5    Use sentence case for headings: 'Database Maintenance'.
	- 1537:4    Use sentence case for headings: 'Service Management'.
	- 1539:5    Use sentence case for headings: 'Systemd Commands'.
	- 1558:5    Use sentence case for headings: 'Log Management'.
	- 1579:4    Use sentence case for headings: 'Update Procedures'.
	- 1581:5    Use sentence case for headings: 'Minor Updates'.
	- 1599:5    Use sentence case for headings: 'Major Updates'.
	- 1623:4    Use sentence case for headings: 'Performance Optimization'.
	- 1631:5    Use sentence case for headings: 'Memory Management (sysctl tuning)'.
	- 1645:5    Use sentence case for headings: 'Network Stack Optimization'.
	- 1659:5    Use sentence case for headings: 'Storage Optimization'.
	- 1669:4    Use sentence case for headings: 'Backup and Recovery'.
	- 1671:5    Use sentence case for headings: 'Regular Backups'.
	- 1690:5    Use sentence case for headings: 'Recovery Procedure'.
	- 1708:4    Use sentence case for headings: 'Security Considerations'.

skill.md:
	- 24:3    Use sentence case for headings: 'Sei Developer Documentation'.
	- 97:4    Use sentence case for headings: 'Precompile addresses'.


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