docs: add insert_before/after_section to edit_note docs

New edit_note operations from basic-memory 0b0c072f. Updates What's New
and MCP Tools Reference with the full operation list.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phernandez

content/2.whats-new/0.v0.19.0.md

@@ -138,6 +138,16 @@ Your notes are now protected from accidental overwriting. If a note already exis
 
 ---
 
+## Smarter Note Editing
+
+`edit_note` gains two new operations: `insert_before_section` and `insert_after_section`. These let your AI insert content relative to a section heading without replacing what's already there.
+
+For example, if your AI needs to add a new section before "## Relations" or append context after "## Observations," these operations handle it cleanly — preserving existing content and maintaining proper spacing.
+
+The full set of `edit_note` operations is now: `append`, `prepend`, `find_replace`, `replace_section`, `insert_before_section`, and `insert_after_section`.
+
+---
+
 ## JSON Output Mode
 
 All tools now support a structured JSON output format for developers building integrations or pipelines. The default human-readable text output is unchanged.

content/8.reference/2.mcp-tools-reference.md

@@ -61,9 +61,9 @@ Edit an existing note incrementally.
 | Parameter | Type | Required | Notes |
 |---|---|---|---|
 | `identifier` | string | Yes | Exact note identifier |
-| `operation` | string | Yes | `append`, `prepend`, `find_replace`, `replace_section` |
+| `operation` | string | Yes | `append`, `prepend`, `find_replace`, `replace_section`, `insert_before_section`, `insert_after_section` |
 | `content` | string | Yes | New content |
-| `section` | string | Conditional | Required for `replace_section` |
+| `section` | string | Conditional | Required for `replace_section`, `insert_before_section`, `insert_after_section` |
 | `find_text` | string | Conditional | Required for `find_replace` |
 | `expected_replacements` | integer | No | Default `1` |