Fix EXECUTE/?/DUMP/TYPE/DECIMAL-HEX-OCTAL/ALIGN defects from proof sweep

proof/FINDINGS.md's Isabelle/HOL word-source sweep (§4) flagged five real
defects; this fixes all five and records resolution in that doc:

- EXECUTE (system_words.c): cast a popped cell straight to a DictEntry*
  and called through it with only a null check. Now validates via a new
  shared vm_dict_entry_ok(), promoted out of starforth_words.c's
  ENTROPY@/ENTROPY! guard (dictionary_management.c) so EXECUTE gets the
  same live-entry check.

- ? and DUMP (format_words.c): dereferenced the popped cell as a raw host
  pointer, bypassing vm_addr_ok entirely (out-of-VM-bounds read). Both now
  go through VM_ADDR/vm_addr_ok/vm_load_cell/vm_ptr like every other
  memory word (@, `,`, editor_words.c).

- TYPE (io_words.c): bounds check computed addr+count in signed 64-bit
  arithmetic, which can overflow and bypass the check on large operands.
  Replaced with vm_addr_ok(), which is written to avoid that overflow.

- DECIMAL/HEX/OCTAL (format_words.c): wrote only the BASE memory cell,
  never vm->base, the host-mirror field number-output words actually read
  via current_base() -- so these words silently affected number parsing
  but never printing. Now call the existing vm_set_base() (previously
  only used at boot init), which updates both. vm_get_base/vm_set_base
  promoted to public declarations in include/vm.h.

- ALIGN vs ALLOT/,/C,/2, (dictionary_words.c): disagreed on dictionary
  growth ceiling (2MB vs 5MB). Investigated which was correct rather than
  blindly widening: vm_get_block_addr() maps block N to
  vm->memory + N*BLOCK_SIZE across the full 5MB arena, and
  USER_BLOCKS_START (block 2048) lines up exactly with
  DICTIONARY_MEMORY_SIZE -- so ALLOT/,/C,/2, letting `here` grow past 2MB
  could silently corrupt live block/user data sharing that memory.
  Tightened ALLOT/,/C,/2, to DICTIONARY_MEMORY_SIZE to match ALIGN.

Verified: hosted (amd64) and kernel (amd64, __STARKERNEL__) both build
clean with -Wall -Werror; hosted POST suite 1012/1012 passing (0
regressions); manually exercised EXECUTE, ?/DUMP, TYPE, HEX/DECIMAL/OCTAL,
and large-ALLOT rejection in the REPL.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014Qf6YcnHgaEtEygq3knx19

src/word_source/starforth_words.c

@@ -78,27 +78,6 @@ static uint64_t g_prng_state = 1;
  * Note: Exposed as ENTROPY@ for FORTH compatibility, but measures execution heat.
  * @param vm Pointer to the VM instance
  */
-/**
- * @brief Validate that an address is a valid DictEntry pointer
- * @param vm The VM instance
- * @param candidate The address to validate
- * @return 1 if valid, 0 if not
- */
-static int is_valid_dict_entry(VM* vm, DictEntry* candidate)
-{
-    if (!candidate) return 0;
-
-    /* Walk dictionary to verify this is a real entry - must hold dict_lock */
-    int found = 0;
-    sf_mutex_lock(&vm->dict_lock);
-    for (DictEntry* e = vm->latest; e != NULL; e = e->link)
-    {
-        if (e == candidate) { found = 1; break; }
-    }
-    sf_mutex_unlock(&vm->dict_lock);
-    return found;
-}
-
 void starforth_word_execution_heat_fetch(VM* vm)
 {
     if (vm->dsp < 0)
@@ -119,7 +98,7 @@ void starforth_word_execution_heat_fetch(VM* vm)
     }
 
     /* Guardrail: Validate the pointer is actually a DictEntry */
-    if (!is_valid_dict_entry(vm, entry))
+    if (!vm_dict_entry_ok(vm, entry))
     {
         vm->error = 1;
         log_message(LOG_ERROR, "ENTROPY@: invalid dictionary entry address %p (not in dictionary)", (void*)entry);
@@ -158,7 +137,7 @@ void starforth_word_execution_heat_store(VM* vm)
     }
 
     /* Guardrail: Validate the pointer is actually a DictEntry */
-    if (!is_valid_dict_entry(vm, entry))
+    if (!vm_dict_entry_ok(vm, entry))
     {
         vm->error = 1;
         log_message(LOG_ERROR, "ENTROPY!: invalid dictionary entry address %p (not in dictionary)", (void*)entry);