fix(skills): remove phantom resource references and fix CoC links (#447)

Remove references to non-existent resource files (references/, assets/,
scripts/, examples/) from 115 skill SKILL.md files. These sections
pointed to directories and files that were never created, causing
confusion when users install skills.

Also fix broken Code of Conduct links in issue templates to use
absolute GitHub URLs instead of relative paths that 404.

plugins/blockchain-web3/skills/defi-protocol-templates/SKILL.md

@@ -422,33 +422,3 @@ contract FlashLoanReceiver is IFlashLoanReceiver {
     }
 }
 ```
-
-## Resources
-
-- **references/staking.md**: Staking mechanics and reward distribution
-- **references/liquidity-pools.md**: AMM mathematics and pricing
-- **references/governance-tokens.md**: Governance and voting systems
-- **references/lending-protocols.md**: Lending/borrowing implementation
-- **references/flash-loans.md**: Flash loan security and use cases
-- **assets/staking-contract.sol**: Production staking template
-- **assets/amm-contract.sol**: Full AMM implementation
-- **assets/governance-token.sol**: Governance system
-- **assets/lending-protocol.sol**: Lending platform template
-
-## Best Practices
-
-1. **Use Established Libraries**: OpenZeppelin, Solmate
-2. **Test Thoroughly**: Unit tests, integration tests, fuzzing
-3. **Audit Before Launch**: Professional security audits
-4. **Start Simple**: MVP first, add features incrementally
-5. **Monitor**: Track contract health and user activity
-6. **Upgradability**: Consider proxy patterns for upgrades
-7. **Emergency Controls**: Pause mechanisms for critical issues
-
-## Common DeFi Patterns
-
-- **Time-Weighted Average Price (TWAP)**: Price oracle resistance
-- **Liquidity Mining**: Incentivize liquidity provision
-- **Vesting**: Lock tokens with gradual release
-- **Multisig**: Require multiple signatures for critical operations
-- **Timelocks**: Delay execution of governance decisions

plugins/blockchain-web3/skills/nft-standards/SKILL.md

@@ -353,31 +353,3 @@ contract OptimizedNFT is ERC721A {
     }
 }
 ```
-
-## Resources
-
-- **references/erc721.md**: ERC-721 specification details
-- **references/erc1155.md**: ERC-1155 multi-token standard
-- **references/metadata-standards.md**: Metadata best practices
-- **references/enumeration.md**: Token enumeration patterns
-- **assets/erc721-contract.sol**: Production ERC-721 template
-- **assets/erc1155-contract.sol**: Production ERC-1155 template
-- **assets/metadata-schema.json**: Standard metadata format
-- **assets/metadata-uploader.py**: IPFS upload utility
-
-## Best Practices
-
-1. **Use OpenZeppelin**: Battle-tested implementations
-2. **Pin Metadata**: Use IPFS with pinning service
-3. **Implement Royalties**: EIP-2981 for marketplace compatibility
-4. **Gas Optimization**: Use ERC721A for batch minting
-5. **Reveal Mechanism**: Placeholder → reveal pattern
-6. **Enumeration**: Support walletOfOwner for marketplaces
-7. **Whitelist**: Merkle trees for efficient whitelisting
-
-## Marketplace Integration
-
-- OpenSea: ERC-721/1155, metadata standards
-- LooksRare: Royalty enforcement
-- Rarible: Protocol fees, lazy minting
-- Blur: Gas-optimized trading

plugins/blockchain-web3/skills/solidity-security/SKILL.md

@@ -494,32 +494,3 @@ contract WellDocumentedContract {
     }
 }
 ```
-
-## Resources
-
-- **references/reentrancy.md**: Comprehensive reentrancy prevention
-- **references/access-control.md**: Role-based access patterns
-- **references/overflow-underflow.md**: SafeMath and integer safety
-- **references/gas-optimization.md**: Gas saving techniques
-- **references/vulnerability-patterns.md**: Common vulnerability catalog
-- **assets/solidity-contracts-templates.sol**: Secure contract templates
-- **assets/security-checklist.md**: Pre-audit checklist
-- **scripts/analyze-contract.sh**: Static analysis tools
-
-## Tools for Security Analysis
-
-- **Slither**: Static analysis tool
-- **Mythril**: Security analysis tool
-- **Echidna**: Fuzzing tool
-- **Manticore**: Symbolic execution
-- **Securify**: Automated security scanner
-
-## Common Pitfalls
-
-1. **Using `tx.origin` for Authentication**: Use `msg.sender` instead
-2. **Unchecked External Calls**: Always check return values
-3. **Delegatecall to Untrusted Contracts**: Can hijack your contract
-4. **Floating Pragma**: Pin to specific Solidity version
-5. **Missing Events**: Emit events for state changes
-6. **Excessive Gas in Loops**: Can hit block gas limit
-7. **No Upgrade Path**: Consider proxy patterns if upgrades needed

plugins/blockchain-web3/skills/web3-testing/SKILL.md

@@ -388,28 +388,3 @@ jobs:
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v2
 ```
-
-## Resources
-
-- **references/hardhat-setup.md**: Hardhat configuration guide
-- **references/foundry-setup.md**: Foundry testing framework
-- **references/test-patterns.md**: Testing best practices
-- **references/mainnet-forking.md**: Fork testing strategies
-- **references/contract-verification.md**: Etherscan verification
-- **assets/hardhat-config.js**: Complete Hardhat configuration
-- **assets/test-suite.js**: Comprehensive test examples
-- **assets/foundry.toml**: Foundry configuration
-- **scripts/test-contract.sh**: Automated testing script
-
-## Best Practices
-
-1. **Test Coverage**: Aim for >90% coverage
-2. **Edge Cases**: Test boundary conditions
-3. **Gas Limits**: Verify functions don't hit block gas limit
-4. **Reentrancy**: Test for reentrancy vulnerabilities
-5. **Access Control**: Test unauthorized access attempts
-6. **Events**: Verify event emissions
-7. **Fixtures**: Use fixtures to avoid code duplication
-8. **Mainnet Fork**: Test with real contracts
-9. **Fuzzing**: Use property-based testing
-10. **CI/CD**: Automate testing on every commit