feat: upgrade full/ package to PG 18, remove deparse + proto.js

[pyramation]

Summary

Upgrades the full/ (@libpg-query/parser) package from libpg_query 17-6.1.0 to 18.0.0 and removes deparse functionality (handled downstream via pgsql-deparser).

Changes:

• Makefile: LIBPG_QUERY_TAG → 18.0.0, removed _wasm_deparse_protobuf, _wasm_parse_query_protobuf, _wasm_get_protobuf_len from EXPORTED_FUNCTIONS
• wasm_wrapper.c: Removed wasm_deparse_protobuf(), wasm_parse_query_protobuf(), wasm_get_protobuf_len() C functions
• index.ts: Removed deparse(), deparseSync() exports and proto.js import
• package.json: Removed proto.js from files, removed @launchql/protobufjs dep and @launchql/proto-cli devDep, removed protogen script, updated @pgsql/types to ^18.0.0
• Deleted: full/proto.js (5.2 MB), full/scripts/protogen.js, full/test/deparsing.test.js
• CI: Updated full matrix entry from version 17 to 18
• Docs: Removed deparse API docs from full/README.md, updated root README.md

Remaining exports: parse, parseSync, parsePlPgSQL, parsePlPgSQLSync, fingerprint, fingerprintSync, normalize, normalizeSync, scan, scanSync

BREAKING CHANGE: deparse() and deparseSync() are no longer exported.

Review & Testing Checklist for Human

• Verify the WASM build compiles successfully against libpg_query 18.0.0 (CI build-wasm job)
• Verify all remaining tests pass (parse, plpgsql, fingerprint, normalize, scan, errors) across all 3 OS
• Confirm no downstream consumers of @libpg-query/parser rely on deparse/deparseSync — these are removed
• After merge, test parsePlPgSQL with PG 18's reworked PL/pgSQL parser to confirm behavior matches expectations

Notes

• The PL/pgSQL C API signature (pg_query_parse_plpgsql) is unchanged in PG 18 — the rework is internal to how it processes input
• The protobuf/pg_query.pb-c.h include is retained in wasm_wrapper.c because wasm_scan() uses pg_query__scan_result__unpack from it
• Removes ~113k lines (mostly the 5.2 MB proto.js)

Link to Devin session: https://app.devin.ai/sessions/5d3588c124524869b388ced885962d70
Requested by: @pyramation

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​pgsql/​types@​18.0.0

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