chore: install openagent opencode

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

.opencode/context/core/context-system/operations/extract.md

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+<!-- Context: core/extract | Priority: medium | Version: 1.0 | Updated: 2026-02-15 -->
+
+# Extract Operation
+
+**Purpose**: Extract context from docs, code, or URLs into organized context files
+
+**Last Updated**: 2026-01-06
+
+---
+
+## When to Use
+
+- Extracting from documentation (React docs, API docs, etc.)
+- Extracting from codebase (patterns, conventions)
+- Extracting from URLs (blog posts, guides)
+- Creating initial context for new topics
+
+---
+
+## 7-Stage Workflow
+
+### Stage 1: Read Source
+```
+/context extract from https://react.dev/hooks
+  ↓
+Agent: "Reading source (8,500 lines)...
+Analyzing content for extractable items..."
+```
+
+**Action**: Read and analyze source material
+
+---
+
+### Stage 2: Analyze & Categorize
+**Action**: Extract and categorize content by function
+
+**Categorization**:
+- Design decisions → `concepts/`
+- Working code → `examples/`
+- Step-by-step workflows → `guides/`
+- Reference data (commands, paths) → `lookup/`
+- Errors/gotchas → `errors/`
+
+**Output**: List of extractable items with previews
+
+---
+
+### Stage 3: Select Category (APPROVAL REQUIRED)
+**Action**: User chooses target category and items
+
+**Format**:
+```
+Found 12 extractable items from {source}:
+
+Concepts (8):
+  ✓ [A] useState - State management hook
+  ✓ [B] useEffect - Side effects hook
+  ... (6 more)
+
+Errors (4):
+  ✓ [I] Hooks called conditionally
+  ✓ [J] Hooks in loops
+  ... (2 more)
+
+Which category?
+  [1] development/
+  [2] core/
+  [3] Create new category: ___
+
+Select items (A B I or 'all') + category (1/2/3):
+```
+
+**Validation**: MUST wait for user input before proceeding
+
+---
+
+### Stage 4: Preview (APPROVAL REQUIRED)
+**Action**: Show what will be created, check for conflicts
+
+**Format**:
+```
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+Extraction Plan: development/
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+CREATE (new files):
+  concepts/use-state.md (45 lines)
+  concepts/use-effect.md (52 lines)
+  concepts/use-context.md (38 lines)
+  ... (6 more)
+  guides/custom-hooks.md (87 lines)
+  guides/debugging-hooks.md (65 lines)
+
+ADD TO (existing files):
+  errors/react-hooks-errors.md (98 → 124 lines)
+    + 4 new error entries
+
+⚠️  CONFLICT (file already exists):
+  concepts/use-memo.md already exists (42 lines)
+    Options:
+      [A] Skip — keep existing file
+      [B] Overwrite — replace with extracted version
+      [C] Merge — add new content to existing file (42 → 58 lines)
+    Choose [A/B/C]: _
+
+NAVIGATION UPDATE:
+  development/navigation.md
+    + 9 new entries in Concepts table
+    + 2 new entries in Guides table
+    + 1 updated entry in Errors table
+
+Total: 12 files, ~650 lines
+
+Preview content? (type filename, 'all' for batch, or 'skip')
+Approve? [y/n/edit]: _
+```
+
+**If user types 'all'**: Show first 10 lines of each file in sequence
+**If user types filename**: Show full content of that file
+**If user types 'skip'**: Proceed to approval
+
+**Validation**: MUST get approval before proceeding
+
+---
+
+### Stage 5: Create
+**Action**: Create files in function folders
+
+**Process**:
+1. Apply MVI format (1-3 sentences, 3-5 key points, minimal example)
+2. Create files in correct function folders
+3. Ensure all files <200 lines
+4. Add cross-references
+
+**Enforcement**: `@critical_rules.mvi_strict` + `@critical_rules.function_structure`
+
+---
+
+### Stage 6: Update Navigation (preview included in Stage 4)
+**Action**: Update navigation.md and add cross-references
+
+**Process**:
+1. Update category navigation.md with new files (as previewed in Stage 4)
+2. Add priority levels (critical/high/medium/low)
+3. Add cross-references between related files
+4. Update "Last Updated" dates
+
+---
+
+### Stage 7: Report
+**Action**: Show comprehensive results
+
+**Format**:
+```
+✅ Extracted X items into {category}
+📄 Created Y files
+📊 Updated {category}/README.md
+
+Files created:
+  - {category}/concepts/ (N files)
+  - {category}/examples/ (N files)
+  - {category}/errors/ (N files)
+```
+
+---
+
+## Examples
+
+### Extract from URL
+```bash
+/context extract from https://react.dev/hooks
+```
+
+### Extract from Local Docs
+```bash
+/context extract from docs/api.md
+/context extract from docs/architecture/
+```
+
+### Extract from Code
+```bash
+/context extract from src/utils/
+```
+
+---
+
+## Success Criteria
+
+- [ ] All files <200 lines?
+- [ ] MVI format applied (1-3 sentences, 3-5 points, example, reference)?
+- [ ] Files in correct function folders?
+- [ ] README.md updated?
+- [ ] Cross-references added?
+- [ ] User approved before creation?
+
+---
+
+## Related
+
+- standards/mvi.md - What to extract
+- guides/compact.md - How to minimize
+- guides/workflows.md - Interactive examples