add README.md for plpgsql-parse package (fixes makage assets copy step)

Author: pyramation

packages/plpgsql-parse/README.md

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+# plpgsql-parse
+
+<p align="center" width="100%">
+  <img height="250" src="https://raw.githubusercontent.com/constructive-io/constructive/refs/heads/main/assets/outline-logo.svg" />
+</p>
+
+Comment preserving PL/pgSQL parser. A wrapper around `plpgsql-parser` and `plpgsql-deparser` that preserves `--` line comments inside PL/pgSQL function bodies through parse-deparse round trips.
+
+## Installation
+
+```sh
+npm install plpgsql-parse
+```
+
+## Features
+
+* **Body Comment Preservation** -- Retains `--` line comments inside PL/pgSQL function bodies (`$$...$$`) through parse-deparse cycles
+* **Outer SQL Comment Preservation** -- Preserves comments and whitespace outside function definitions via `pgsql-parse`
+* **Idempotent Round-Trips** -- `parse -> deparse -> parse -> deparse` produces identical output
+* **Non-Invasive** -- Does not modify `plpgsql-parser`, `plpgsql-deparser`, or any other upstream packages
+
+## How It Works
+
+1. Uses `pgsql-parse` for outer SQL comment and whitespace preservation
+2. For each PL/pgSQL function, scans the `$$...$$` body to extract `--` comments with line numbers
+3. Associates each comment with the nearest following PL/pgSQL statement (anchor)
+4. On deparse, re-injects comments by matching statement keywords against the deparsed output
+
+## API
+
+### Parse
+
+```typescript
+import { parseSync, deparseSync, loadModule } from 'plpgsql-parse';
+
+await loadModule();
+
+const result = parseSync(`
+-- Create a counter function
+CREATE FUNCTION get_count() RETURNS int LANGUAGE plpgsql AS $$
+BEGIN
+  -- Count active users
+  RETURN (SELECT count(*) FROM users WHERE active);
+END;
+$$;
+`);
+
+// result.enhanced contains outer SQL comments/whitespace
+// result.functions contains body comments for each PL/pgSQL function
+const sql = deparseSync(result);
+// Output preserves both outer and body comments
+```
+
+## Credits
+
+Built on the excellent work of several contributors:
+
+* **[Dan Lynch](https://github.com/pyramation)** -- official maintainer since 2018 and architect of the current implementation
+* **[Lukas Fittl](https://github.com/lfittl)** for [libpg_query](https://github.com/pganalyze/libpg_query) -- the core PostgreSQL parser that powers this project