refactor: rename nssa/nssa_core → lee/lee_core

Follow the spel fork's `nssa → lee` refactor (chore/update-lez): the
`#[lez_program]` macro now emits `lee_core::…` paths, so the crate must be
referenced by its real name rather than the `nssa_core` alias.

- Cargo.toml: rename the `nssa_core`/`nssa` dep keys to `lee_core`/`lee` and
  drop the now-redundant `package = "lee_core"`/`package = "lee"` aliases
  (dep name == package name).
- Rust: `nssa_core::` → `lee_core::`, `nssa::` → `lee::` across programs,
  modules, and tools.
- Docs: update the library reference in CLAUDE.md and README.md.

Also drop the dead `NSSA_WALLET_HOME_DIR` env var — superseded by
`LEE_WALLET_HOME_DIR`, which is the only wallet-home var any v0.2.x wallet
reads — from the test tooling (setup-amm-testnet.sh, custom-token.mjs,
run-basecamp-e2e.sh) and docs.

Closes #225

apps/amm/tests/custom-token.mjs

@@ -80,7 +80,7 @@ async function saveShot(app, name) {
 function resolveTokenD() {
   const out = execFileSync("wallet", ["account", "id", "--account-id", "token-d-def"], {
     encoding: "utf8",
-    env: { ...process.env, LEE_WALLET_HOME_DIR: WALLET_HOME, NSSA_WALLET_HOME_DIR: WALLET_HOME },
+    env: { ...process.env, LEE_WALLET_HOME_DIR: WALLET_HOME },
   });
   const id = (out.match(/[1-9A-HJ-NP-Za-km-z]{32,44}/) || [])[0];
   if (!id)

apps/amm/tests/testnet/setup-amm-testnet.sh

@@ -51,12 +51,10 @@ cd "$REPO_ROOT"
 # TEST WALLET — isolated + deterministic
 ###############################################################################
 
-# Dedicated wallet home for tests. Kept out of git (see .gitignore). Exported
-# under both env var names so whichever the installed `wallet`/`spel` expects is
-# satisfied (the current wallet uses LEE_WALLET_HOME_DIR).
+# Dedicated wallet home for tests. Kept out of git (see .gitignore). The v0.2.x
+# wallet/spel read LEE_WALLET_HOME_DIR (the old NSSA_WALLET_HOME_DIR is unused).
 TEST_WALLET_HOME="${TEST_WALLET_HOME:-$SCRIPT_DIR/.wallet}"
 export LEE_WALLET_HOME_DIR="$TEST_WALLET_HOME"
-export NSSA_WALLET_HOME_DIR="$TEST_WALLET_HOME"
 
 # The deterministic test seed. A wallet restored from this mnemonic yields the
 # same account ids every time, which is why they can be shared/pinned.

apps/token/tests/run-basecamp-e2e.sh

@@ -67,7 +67,6 @@ QT_FORCE_STDERR_LOGGING=1 \
 QML_DISABLE_DISK_CACHE=1 \
 QML_INSPECTOR_PORT="${inspector_port}" \
 LEE_WALLET_HOME_DIR="${wallet_home}" \
-NSSA_WALLET_HOME_DIR="${wallet_home}" \
 LD_LIBRARY_PATH="${bundle_root}/lib${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}" \
 "${basecamp_bin}" --user-dir "${run_root}/user" -platform offscreen \
   >"${run_root}/basecamp.log" 2>&1 &