feat: add projection and intercept support, remove TOML, fix freeDevMem symbol bug

- Remove TOML dependency from Makefile and compose_device.c
- Implement projection support in config handler: remap device memory
  segments between devices via cells[] pointer reassignment
- Implement intercept support: shadow_copy (write to both devices) and
  shadow_replace (redirect read/write to another device) modes using
  smartAddr handler infrastructure
- Fix critical bug in hmmmm.c: freeDevMem was loaded from "freeDevSpecs"
  symbol instead of "freeDevMem", causing segfault on config reload
- Add intercept context lifecycle management to EmulContext

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

inc/context.h

@@ -32,6 +32,8 @@ typedef struct {
     uint8_t** devicesMem;
     size_t devicesCount;
     void** deviceHandles;   // device_handle_t** — dynamically loaded devices
+    void** interceptCtxs;   // intercept_ctx_t** — heap-allocated intercept contexts
+    size_t interceptCtxCount;
     flatcc_builder_t stream_builder;
 } EmulContext;