Add changeset for indented format feature

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: konard

js/.changeset/add-indented-format.md

@@ -0,0 +1,21 @@
+---
+"lino-objects-codec": minor
+---
+
+Add indented Links Notation format support for human-readable object display.
+
+New functions:
+- `formatIndented({ id, obj, indent })` - Format an object with identifier in indented style
+- `parseIndented({ text })` - Parse indented format back to { id, obj }
+
+The indented format displays objects as:
+```
+<identifier>
+  <key> "<value>"
+  <key> "<value>"
+  ...
+```
+
+Also adds:
+- `escapeReference()` for escaping values with special characters
+- `unescapeReference()` for reversing escape sequences