feat(rust): Expand Rust kernel layer with SHA3, AES, DCache, Watchdog, JSON tokenizer & quote-aware shell

- Implement FIPS 202 SHA3-256 and SHA3-512 (Keccak-f[1600]) in pure Rust
- Implement FIPS 197 AES-128 block cipher in pure Rust
- Implement VFS fast path Directory Entry Cache (dcache) in Rust
- Implement Kernel Health Watchdog & Heartbeat Monitor in Rust
- Implement Zero-Copy JSON Tokenizer & Key-Value extractor in Rust
- Implement memory-safe PCI Vendor/Class database in Rust
- Add quote-aware tokenization to LazyBox shell parser
- Register 'sha3sum', 'dcache', 'watchdog', and 'jsonquery' applets

userland/lazybox/shell.c

@@ -252,8 +252,16 @@ static void shell_process(const char* cmd) {
     while (*token) {
         while (*token == ' ') *token++ = '\0';
         if (*token == '\0') break;
-        if (argc < 16) argv[argc++] = token;
-        while (*token && *token != ' ') token++;
+
+        if (*token == '"' || *token == '\'') {
+            char quote = *token++;
+            if (argc < 16) argv[argc++] = token;
+            while (*token && *token != quote) token++;
+            if (*token == quote) *token++ = '\0';
+        } else {
+            if (argc < 16) argv[argc++] = token;
+            while (*token && *token != ' ') token++;
+        }
     }
     if (argc == 0) return;