feat(KB-001): complete Step 6 — documentation and changeset

.changeset/add-github-issue-import.md

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+---
+"@dustinbyrne/kb": minor
+---
+
+Add ability to import new tasks from GitHub issues
+
+Users can now run `kb task import <owner/repo>` to fetch open issues from a GitHub repository and create tasks from them. Each imported issue becomes a task in the "triage" column with:
+- Issue title as task title (truncated to 200 chars)
+- Issue body as description with source URL appended
+- Duplicate detection based on source URL
+
+Options:
+- `--limit, -l <n>`: Max issues to import (default: 30, max: 100)
+- `--labels, -L <labels>`: Comma-separated label filter (e.g., "bug,enhancement")
+
+Pi extension also includes new `kb_task_import_github` tool for programmatic access.
+
+Requires `GITHUB_TOKEN` env var for private repositories and to avoid rate limits.