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Also drop the dead `NSSA_WALLET_HOME_DIR` env var — superseded by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

modules/token/ffi/src/api/decode.rs

@@ -1,4 +1,4 @@
-use nssa_core::{
+use lee_core::{
     account::{Account, AccountId},
     program::ProgramId,
 };

modules/token/ffi/src/api/mod.rs

@@ -54,6 +54,6 @@ impl fmt::Display for TokenApiError {
 
 impl Error for TokenApiError {}
 
-fn parse_token_program_id(value: &str) -> Result<nssa_core::program::ProgramId, TokenApiError> {
+fn parse_token_program_id(value: &str) -> Result<lee_core::program::ProgramId, TokenApiError> {
     parse_program_id(value).map_err(|_| TokenApiError::new("bad_request"))
 }

modules/token/ffi/src/api/plan.rs

@@ -1,4 +1,4 @@
-use nssa_core::account::AccountId;
+use lee_core::account::AccountId;
 use risc0_binfmt::ProgramBinary;
 use serde_json::{json, Value};
 use token_core::{Instruction, MetadataStandard, NewTokenDefinition, NewTokenMetadata};
@@ -18,7 +18,7 @@ use crate::account::{account_id_from_hex, account_id_hex, program_id_bytes};
 pub fn program_id(request: ProgramIdRequest) -> TokenResult {
     let elf = hex::decode(&request.elf).map_err(|_| TokenApiError::new("bad_request"))?;
     let binary = ProgramBinary::decode(&elf).map_err(|_| TokenApiError::new("bad_request"))?;
-    let image_id: nssa_core::program::ProgramId = binary
+    let image_id: lee_core::program::ProgramId = binary
         .compute_image_id()
         .map_err(|_| TokenApiError::new("backend_error"))?
         .into();
@@ -298,7 +298,7 @@ fn reject_zero_account_id(account_id: AccountId, code: &'static str) -> Result<(
 }
 
 fn plan_response<const N: usize>(
-    program_id: nssa_core::program::ProgramId,
+    program_id: lee_core::program::ProgramId,
     account_ids: [AccountId; N],
     signing_requirements: [bool; N],
     instruction: Instruction,

modules/token/ffi/src/api/tests.rs

@@ -1,4 +1,4 @@
-use nssa_core::{
+use lee_core::{
     account::{Account, AccountId, Data, Nonce},
     program::ProgramId,
 };