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>

json-ptr/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "json-ptr"
+version = "0.1.0"
+authors = ["Aiden McClelland <me@drbonez.dev>"]
+edition = "2021"
+keywords = ["json", "json-pointer"]
+description = "RFC 6901, JavaScript Object Notation (JSON) Pointer"
+repository = "https://github.com/dr-bonez/json-ptr"
+license = "MIT"
+readme = "README.md"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+imbl = "6"
+imbl-value = "0.4.1"
+serde = "1"
+thiserror = "2"