chore(native): remove false-green TypeScript suites now covered by Rust tests

The three native examples now have real LiteSVM Rust tests, so their
TypeScript suites — which imported from `node:test` but ran under
`ts-mocha`, executing zero tests (false green) — are removed along with
their now-unused JS tooling (ts-mocha, mocha, chai, solana-bankrun, etc.)
and tsconfig.json. `build-and-test` is rewired to just build the program
.so into tests/fixtures, which is what the LiteSVM `cargo test` consumes;
the empty lockfiles keep `pnpm install --frozen-lockfile` passing in CI.

Also fix the stale .gitignore exception path for the escrow Cargo.lock
(escrow moved from tokens/ to finance/) and document the real reason it
stays tracked (standalone, non-workspace crate).

Author: claude

.gitignore

@@ -8,8 +8,9 @@ node_modules/
 **/*/node_modules
 **/*/package-lock.json
 **/*/Cargo.lock
-# Exception: escrow native needs Cargo.lock to pin blake3 (see tokens/escrow/native/Cargo.toml)
-!tokens/escrow/native/Cargo.lock
+# Exception: escrow native is a standalone (non-workspace) crate, so it keeps
+# its Cargo.lock tracked for reproducible builds.
+!finance/escrow/native/Cargo.lock
 
 **/*/.anchor
 **/*/.DS_Store

finance/escrow/native/package.json

@@ -1,25 +1,7 @@
 {
   "scripts": {
-    "test": "pnpm ts-mocha -p ./tsconfig.json -t 1000000 ./tests/test.ts",
-    "build-and-test": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./tests/fixtures && pnpm test",
+    "build-and-test": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./tests/fixtures",
     "build": "cargo build-sbf --manifest-path=./program/Cargo.toml --sbf-out-dir=./program/target/so",
-    "deploy": "solana program deploy ./program/target/so/program.so"
-  },
-  "dependencies": {
-    "@solana/spl-token": "^0.4.9",
-    "@solana/web3.js": "^1.98.4",
-    "bn.js": "^5.2.2"
-  },
-  "devDependencies": {
-    "@types/bn.js": "^5.1.0",
-    "@types/chai": "^4.3.1",
-    "@types/mocha": "^10.0.9",
-    "@types/node": "^22.8.6",
-    "borsh": "^2.0.0",
-    "chai": "^4.3.4",
-    "mocha": "^10.8.2",
-    "solana-bankrun": "^0.4.0",
-    "ts-mocha": "^10.0.0",
-    "typescript": "^5"
+    "deploy": "solana program deploy ./program/target/so/escrow_native_program.so"
   }
 }