chore: install openagent opencode

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

.opencode/context/core/context-system/guides/compact.md

@@ -0,0 +1,122 @@
+<!-- Context: core/compact | Priority: high | Version: 1.1 | Updated: 2026-02-15 -->
+
+# Context Compaction (Minimization)
+
+**Purpose**: Compress verbose content into minimal viable information
+
+**Last Updated**: 2026-02-15
+
+---
+
+## Core Idea
+
+Transform verbose explanations → core concepts following MVI principle.
+
+**Formula**: Verbose Content → Core Concept (1-3 sentences) → Key Points (3-5 bullets) → Minimal Example (<10 lines) → Reference Link → Compact File
+
+---
+
+## 5 Compression Techniques
+
+### 1. Extract Core Concept
+**From**: Paragraphs → **To**: 1-3 sentences  
+**Rule**: If you can't explain it in 3 sentences, simplify further.
+
+### 2. Bulletize Key Points
+**From**: Long paragraphs → **To**: 3-5 bullet points  
+**Rule**: Each bullet = one key fact. No sub-bullets.
+
+### 3. Minimize Examples
+**From**: Full implementations → **To**: Smallest working example (<10 lines)  
+**Rule**: Show the simplest case. Link to full examples.
+
+### 4. Replace Repetition with References
+**From**: Same info repeated → **To**: Define once, reference with links  
+**Rule**: Say it once in concepts/, reference everywhere else.
+
+### 5. Convert Prose to Tables
+**From**: Paragraphs listing things → **To**: Scannable tables  
+**Rule**: If listing >3 items, use a table or bullets.
+
+---
+
+## Compaction Checklist
+
+- [ ] Core concept is 1-3 sentences?
+- [ ] Key points are 3-5 bullets (no sub-bullets)?
+- [ ] Example is <10 lines of code?
+- [ ] No repeated explanations?
+- [ ] Reference link added for deep dive?
+- [ ] File is under line limit?
+- [ ] Can be scanned in <30 seconds?
+
+---
+
+## Common Bloat Patterns to Remove
+
+| Bloat Type | ❌ Avoid | ✅ Use Instead |
+|------------|---------|---------------|
+| Over-Explaining | "This is important because it allows you to manage state in a more efficient way..." | "Manages state efficiently" |
+| Historical Context | "Before React 16.8, we used class components..." | Skip history unless critical |
+| Multiple Examples | Example 1, 2, 3, 4... | ONE simple example + link |
+| Implementation Details | "The internal implementation uses a fiber architecture..." | Skip internals, show usage |
+
+---
+
+## Target Line Counts
+
+| File Type | Target | Max |
+|-----------|--------|-----|
+| Concept | 40-60 | 100 |
+| Example | 30-50 | 80 |
+| Guide | 60-100 | 150 |
+| Lookup | 20-40 | 100 |
+| Error | 50-80 | 150 |
+
+**Philosophy**: If you hit max lines, split into multiple files or reference external docs.
+
+---
+
+## The 30-Second Rule
+
+<rule id="thirty_second_rule" enforcement="strict">
+  Every context file must be scannable in <30 seconds.
+</rule>
+
+**Test**: Can someone unfamiliar explain it back in 30 seconds?
+
+---
+
+## Quick Example
+
+**Before (150 lines)**: Long authentication system explanation with edge cases, examples, etc.
+
+**After (45 lines)**:
+```markdown
+# Concept: Authentication
+
+**Core Idea**: JWT-based stateless auth. Token in httpOnly cookie, verified on every request.
+
+**Key Points**:
+- Token has userId + role claims
+- Expires in 1 hour (refresh token for renewal)
+- Stored in httpOnly cookie (XSS protection)
+- Verified via middleware on protected routes
+
+**Quick Example**:
+```js
+const token = jwt.sign({ userId: 123 }, SECRET, { expiresIn: '1h' })
+res.cookie('auth', token, { httpOnly: true })
+```
+
+**Reference**: https://docs.company.com/auth
+**Related**: examples/jwt-auth.md, errors/auth-errors.md
+```
+
+---
+
+## Related
+
+- mvi.md - MVI principle
+- harvest.md - When to compact
+- templates.md - Standard formats