audit fixes, repo restructure, and documentation

Soundness and performance audit (17 fixes):
- See AUDIT.md for full details and @claude comments in code

Repo restructure:
- Inline json-ptr and json-patch submodules as regular directories
- Remove cbor submodule, replace serde_cbor with ciborium
- Rename patch-db/ -> core/, patch-db-macro/ -> macro/,
  patch-db-macro-internals/ -> macro-internals/, patch-db-util/ -> util/
- Purge upstream CI/CD, bench, and release cruft from json-patch
- Remove .gitmodules

Test fixes:
- Fix proptest doesnt_crash (unique file paths, proper close/cleanup)
- Add PatchDb::close() for clean teardown

Documentation:
- Add README.md, ARCHITECTURE.md, CONTRIBUTING.md, CLAUDE.md, AUDIT.md
- Add TSDocs to TypeScript client exports

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

macro/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "patch-db-macro"
+version = "0.1.0"
+authors = ["Aiden McClelland <me@drbonez.dev>"]
+edition = "2018"
+description = "macros for defining typed patch dbs"
+license = "MIT"
+repository = "https://github.com/Start9Labs/patch-db"
+
+[lib]
+proc-macro = true
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+patch-db-macro-internals = { path = "../macro-internals" }
+syn = "1.0.62"
+proc-macro2 = "1.0.1"

macro/rustfmt.toml

@@ -0,0 +1,2 @@
+group_imports = "StdExternalCrate"
+imports_granularity = "Module"

macro/src/lib.rs

@@ -0,0 +1,10 @@
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+use syn::{parse_macro_input, DeriveInput};
+
+#[proc_macro_derive(HasModel, attributes(model))]
+pub fn model(item: TokenStream) -> TokenStream {
+    let item = parse_macro_input!(item as DeriveInput);
+    patch_db_macro_internals::build_model(&item).into()
+}