feat: type hints green [bracketed] notation, workspace cleanup, unique naming

- Type inference hints now show value-first with bracketed type in comment
  green: "0x7ff718570000 [ptr64]", "6, 16 [int32_t×2]"
- Raise hint threshold to strong-only (score >= 75%)
- Remove Bool inference, widen Int16 range to ±16384
- Workspace: remove dead WorkspaceProxy, fix null deref, debounce search,
  cache icons, add pinning support
- Unique naming: UnnamedClass0/UnnamedEnum1 with global counter
- Footer buttons: +10h +100h +1000h replacing +1024
- MCP: project lifecycle API, snapshot provider fix

src/providers/snapshot_provider.h

@@ -53,6 +53,7 @@ public:
     bool isReadable(uint64_t addr, int len) const override {
         if (len <= 0) return (len == 0);
         uint64_t end = addr + static_cast<uint64_t>(len);
+        if (end < addr) return false;   // overflow
         for (uint64_t p = addr & kPageMask; p < end; p += kPageSize) {
             if (!m_pages.contains(p)) return false;
         }