feat: add standard issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "Bug Report"
+about: "Report a bug in the OrbitStream Soroban Contract"
+title: "[BUG] "
+labels: ["bug", "needs-triage"]
+assignees: ""
+---
+
+# Bug Report
+
+## 🔍 Is this a regression?
+
+<!-- Did this work before and now it's broken? If so, which version last worked? -->
+
+## 📝 Description
+
+<!-- A clear and concise description of what the bug is. -->
+
+## 🔄 Steps to Reproduce
+
+1. 
+2. 
+3. 
+
+## ✅ Expected Behavior
+
+<!-- What you expected to happen. -->
+
+## ❌ Actual Behavior
+
+<!-- What actually happened. Include error messages or transaction hashes. -->
+
+## 🌍 Environment
+
+- **OS**: [e.g., Ubuntu 22.04, macOS 14]
+- **Rust version**: [e.g., 1.75.0]
+- **Soroban SDK version**: [e.g., 21.0.0]
+- **Stellar network**: [testnet / mainnet]
+- **Contract deployment**: [deployed / local only]
+
+## 📋 Contract Details
+
+- **Contract name**: [e.g., OrbitStream]
+- **Contract ID**: [e.g., CABC...1234 (if deployed)]
+- **Function called**: [e.g., create_escrow]
+- **Transaction hash**: [e.g., abc123... (if applicable)]
+
+## 📋 Arguments Passed
+
+<!-- Paste the exact arguments used to call the contract function. -->
+
+```rust
+// Example
+client.create_escrow(&buyer, &seller, &token, &1000, &3600);
+```
+
+## 🔍 Error Output
+
+<!-- Paste the full error message or panic output. -->
+
+```
+[Paste error here]
+```
+
+## 🧪 Test Case
+
+<!-- If possible, provide a minimal Rust test that reproduces the issue. -->
+
+```rust
+#[test]
+fn test_reproduce_bug() {
+    let env = Env::default();
+    // ...
+}
+```
+
+## 📋 Storage State
+
+<!-- If the bug involves contract state, describe the relevant storage entries. -->
+
+## 📎 Additional Context
+
+<!-- Any other context about the problem. -->
+
+## ✅ Checklist
+
+- [ ] I have searched existing issues and this is not a duplicate
+- [ ] I am using the latest version of Soroban SDK
+- [ ] I have included contract function and arguments
+- [ ] I have included error output

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Documentation
+    url: https://github.com/your-org/OrbitStream/blob/main/orbitstream_docs/README.md
+    about: Read the OrbitStream documentation before opening an issue
+  - name: Security Vulnerability
+    url: https://github.com/your-org/OrbitStream/security/advisories/new
+    about: Report security vulnerabilities privately

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "Feature Request"
+about: "Suggest a new feature or enhancement for the OrbitStream Soroban Contract"
+title: "[FEAT] "
+labels: ["enhancement", "needs-triage"]
+assignees: ""
+---
+
+# Feature Request
+
+## 📝 Summary
+
+<!-- A clear, one-sentence summary of the feature you want. -->
+
+## 🎯 Problem Statement
+
+<!-- What problem does this feature solve? Why is it needed? -->
+
+## 💡 Proposed Solution
+
+<!-- Describe your ideal solution. Be as specific as possible. -->
+
+## 🔄 Alternatives Considered
+
+<!-- Have you considered other approaches? Why is your preferred solution better? -->
+
+## 📋 Acceptance Criteria
+
+<!-- How will we know this feature is complete? List specific, testable criteria. -->
+
+- [ ] Criterion 1
+- [ ] Criterion 2
+- [ ] Criterion 3
+
+## 🏗️ Implementation Notes
+
+<!-- Any technical details, contract design ideas, or storage considerations. -->
+
+### Contract Function Signature (if applicable)
+
+```rust
+// Example new function
+pub fn new_function(env: Env, param: Address) -> Result<u64, ContractError> {
+    // ...
+}
+```
+
+### Storage Changes (if applicable)
+
+```rust
+// Example storage key additions
+```
+
+### Events (if applicable)
+
+```rust
+// Example new event
+```
+
+### Affected Contract Areas
+
+- [ ] Escrow (create/release/refund)
+- [ ] Storage
+- [ ] Events
+- [ ] Errors
+- [ ] Tests
+- [ ] Other: ___
+
+## 📎 Related Issues/PRs
+
+<!-- Link any related issues, PRs, or discussions. -->
+
+## 📋 Additional Context
+
+<!-- Any other context, references to SEP specs, or design docs. -->
+
+## ✅ Checklist
+
+- [ ] I have searched existing issues and this is not a duplicate
+- [ ] I have clearly described the problem this feature solves
+- [ ] I have provided acceptance criteria
+- [ ] I have considered the impact on existing contract functions