Stage D batch 6: mama_forth_words.c group 4 -- identity/crypto words (FABRIC-3.md §XXXII.6)

MINT + mint_pop_string()/ZUSE-ELIGIBILITY-ADD/ZUSE-ELIGIBLE?/
ELEVATE-PUBKEY-UNPACK, 10 sites. mint_pop_string() gained a field_name
parameter so its diagnostics name which of MINT's four string
arguments failed (phone/email/username/full_name), rather than a
generic message that would leave the operator guessing. Diagnostic
placement matched each function's own sibling convention where one
exists (ZUSE-ELIGIBILITY-ADD), log_message() default otherwise.

Three-arch clean qemu acceptance passed.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BWpNjdwPtFLuVLaAq44L9K

FABRIC-3.md

@@ -4654,3 +4654,18 @@ own WIREBIND attach (every boot) drives `HERA-BLK-ATTACH-REQ`'s `MSG-SEND`, whic
 `SWITCH-MARK-WORK` -- so this fix's own most safety-critical path is exercised by the standard
 acceptance boot itself, not just compiled.
 
+**Batch 6 -- DONE, 2026-09-15: group 4, identity/crypto (`MINT` + `mint_pop_string()`,
+`ZUSE-ELIGIBILITY-ADD`, `ZUSE-ELIGIBLE?`, `ELEVATE-PUBKEY-UNPACK`) -- 10 sites.**
+`mint_pop_string()` gained a `field_name` parameter (`"phone"`/`"email"`/`"username"`/
+`"full_name"`, one per call site) so its three now-diagnosed guards name which of `MINT`'s four
+string arguments actually failed, via `console_println()` -- a generic message would have left
+the operator guessing which one, defeating the point of fixing a silent-minting failure.
+`MINT`'s own `restrict?`-flag guard matches the same convention. `ZUSE-ELIGIBILITY-ADD` matched
+its own existing `console_println()` sibling ("FAILED -- fence write error"). `ZUSE-ELIGIBLE?`
+and `ELEVATE-PUBKEY-UNPACK` have no sibling guard in their own function bodies -- kept
+`log_message()`, the file's established default.
+
+**Verified:** three-architecture `clean qemu` acceptance (amd64/aarch64/riscv64) passed, standard
+regression unaffected -- including the `mint_pop_string()` signature change compiling cleanly
+across all four call sites.
+

capsules/BLOCK_MAP.md

@@ -1,5 +1,5 @@
 # Capsule Block Manifest — Auto-generated
-<!-- Generated by mkcapsule --manifest  2026-09-15T23:13:32Z -->
+<!-- Generated by mkcapsule --manifest  2026-09-15T23:44:09Z -->
 <!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh.  -->
 <!-- Hand-written justifications and immutability notes live  -->
 <!-- in MANIFEST.md alongside this auto-generated index.      -->

src/starkernel/capsule/mama_forth_words.c

@@ -1036,16 +1036,37 @@ static void mama_word_vm_heat(VM *vm)
  */
 /* Pop one ( caddr u ) string pair and copy it, NUL-terminated, into
  * dst (capacity dst_cap). Returns 0 on success, -1 on underflow/bounds/
- * unmapped-address failure (vm->error is set in that case). */
-static int mint_pop_string(VM *vm, char *dst, size_t dst_cap)
+ * unmapped-address failure (vm->error is set in that case). field_name
+ * names which MINT argument this call is popping, for a precise
+ * diagnostic (FABRIC-3.md §XXXII.6) -- this helper is called four times
+ * with different fields, so a generic message would leave the operator
+ * guessing which one actually failed. */
+static int mint_pop_string(VM *vm, char *dst, size_t dst_cap, const char *field_name)
 {
-    if (vm->dsp < 1) { vm->error = 1; return -1; }
+    if (vm->dsp < 1) {
+        console_puts("MINT: expects S\" ");
+        console_puts(field_name);
+        console_println("\" -- nothing on the stack");
+        vm->error = 1;
+        return -1;
+    }
     cell_t u     = vm_pop(vm);
     cell_t caddr = vm_pop(vm);
-    if (u < 0 || (size_t)u >= dst_cap) { vm->error = 1; return -1; }
+    if (u < 0 || (size_t)u >= dst_cap) {
+        console_puts("MINT: ");
+        console_puts(field_name);
+        console_println(" too long or negative length");
+        vm->error = 1;
+        return -1;
+    }
     if (u > 0) {
         const uint8_t *p = vm_ptr(vm, (vaddr_t)caddr);
-        if (!p) { vm->error = 1; return -1; }
+        if (!p) {
+            console_puts("MINT: invalid address on the stack for ");
+            console_println(field_name);
+            vm->error = 1;
+            return -1;
+        }
         memcpy(dst, p, (size_t)u);
     }
     dst[u] = '\0';
@@ -1072,12 +1093,16 @@ static void mama_word_mint(VM *vm)
     char full_name[USER_IDENTITY_FULL_NAME_MAX];
 
     /* Stack order: fname pushed first, restrict? last -- pop in reverse. */
-    if (vm->dsp < 0) { vm->error = 1; return; }
+    if (vm->dsp < 0) {
+        console_println("MINT: expects a restrict? flag on top of the stack");
+        vm->error = 1;
+        return;
+    }
     cell_t restrict_flag = vm_pop(vm);
-    if (mint_pop_string(vm, phone, sizeof(phone)) != 0) return;
-    if (mint_pop_string(vm, email, sizeof(email)) != 0) return;
-    if (mint_pop_string(vm, username, sizeof(username)) != 0) return;
-    if (mint_pop_string(vm, full_name, sizeof(full_name)) != 0) return;
+    if (mint_pop_string(vm, phone, sizeof(phone), "phone") != 0) return;
+    if (mint_pop_string(vm, email, sizeof(email), "email") != 0) return;
+    if (mint_pop_string(vm, username, sizeof(username), "username") != 0) return;
+    if (mint_pop_string(vm, full_name, sizeof(full_name), "full_name") != 0) return;
 
     struct blkio_dev *dev = sk_repl_get_attached_blk_dev();
     if (!dev) {
@@ -1139,6 +1164,7 @@ static void mama_word_mint(VM *vm)
 static void mama_word_zuse_eligibility_add(VM *vm)
 {
     if (vm->dsp < 0) {
+        console_println("ZUSE-ELIGIBILITY-ADD: stack underflow");
         vm->error = 1;
         vm_push(vm, 0);
         return;
@@ -1146,6 +1172,7 @@ static void mama_word_zuse_eligibility_add(VM *vm)
     cell_t caddr = vm_pop(vm);
     const uint8_t *pubkey = vm_ptr(vm, (vaddr_t)caddr);
     if (!pubkey) {
+        console_println("ZUSE-ELIGIBILITY-ADD: invalid address on the stack");
         vm->error = 1;
         vm_push(vm, 0);
         return;
@@ -1170,6 +1197,7 @@ static void mama_word_zuse_eligibility_add(VM *vm)
 static void mama_word_zuse_eligible_query(VM *vm)
 {
     if (vm->dsp < 0) {
+        log_message(LOG_ERROR, "ZUSE-ELIGIBLE?: stack underflow");
         vm->error = 1;
         vm_push(vm, 0);
         return;
@@ -1177,6 +1205,7 @@ static void mama_word_zuse_eligible_query(VM *vm)
     cell_t caddr = vm_pop(vm);
     const uint8_t *pubkey = vm_ptr(vm, (vaddr_t)caddr);
     if (!pubkey) {
+        log_message(LOG_ERROR, "ZUSE-ELIGIBLE?: invalid address on the stack");
         vm->error = 1;
         vm_push(vm, 0);
         return;
@@ -1229,6 +1258,7 @@ static void mama_word_name_to_xt(VM *vm)
 static void mama_word_elevate_pubkey_unpack(VM *vm)
 {
     if (vm->dsp < 4) {
+        log_message(LOG_ERROR, "ELEVATE-PUBKEY-UNPACK: stack underflow");
         vm->error = 1;
         return;
     }
@@ -1238,6 +1268,7 @@ static void mama_word_elevate_pubkey_unpack(VM *vm)
 
     uint8_t *buf = vm_ptr(vm, (vaddr_t)buf_addr);
     if (!buf) {
+        log_message(LOG_ERROR, "ELEVATE-PUBKEY-UNPACK: invalid address on the stack");
         vm->error = 1;
         return;
     }