Phase 3: EntryBleed module — working stage-1 kbase leak brick

- modules/entrybleed_cve_2023_0458/ (promoted out of _stubs):
  - iamroot_modules.{c,h}: full EntryBleed primitive (rdtsc_start/end
    + prefetchnta + KASLR-slot timing sweep) wired into the standard
    iamroot_module interface. x86_64 only; ARM/other gracefully
    return IAMROOT_PRECOND_FAIL.
  - detect(): reads /sys/.../vulnerabilities/meltdown to decide
    KPTI status. Mitigation: PTI → VULNERABLE. Not affected → OK.
  - exploit(): sweeps the 16MiB KASLR range, prints leaked kbase
    (and KASLR slide). JSON-mode emits {"kbase":"0x..."} to stdout.
  - entrybleed_leak_kbase_lib(off) declared as a public library
    helper so future LPE chains needing a stage-1 leak can just
    #include the module's header and call it.
  - entry_SYSCALL_64 slot offset overridable via
    IAMROOT_ENTRYBLEED_OFFSET (default 0x5600000 for lts-6.12.x).

- __always_inline fallback added since glibc/Linux-kernel macro
  isn't universal; module now builds clean under macOS clangd lint
  and on musl.

- iamroot.c registers entrybleed alongside the other families;
  Makefile gains it as a separate object set.

Verified end-to-end on kctf-mgr (Debian 6.12.86):
  iamroot --exploit entrybleed --i-know
  → [+] entrybleed: leaked kbase = 0xffffffff8d800000

This is the FIRST WORKING-EXPLOIT module in IAMROOT (5
copy_fail_family modules wrap existing code from DIRTYFAIL;
dirty_pipe is detect-only). EntryBleed is x86_64 stage-1 brick
that future chains can compose.

Makefile

@@ -36,10 +36,15 @@ DP_DIR   := modules/dirty_pipe_cve_2022_0847
 DP_SRCS  := $(DP_DIR)/iamroot_modules.c
 DP_OBJS  := $(patsubst %.c,$(BUILD)/%.o,$(DP_SRCS))
 
+# Family: entrybleed (single-CVE family, x86_64 only)
+EB_DIR   := modules/entrybleed_cve_2023_0458
+EB_SRCS  := $(EB_DIR)/iamroot_modules.c
+EB_OBJS  := $(patsubst %.c,$(BUILD)/%.o,$(EB_SRCS))
+
 # Top-level dispatcher
 TOP_OBJ  := $(BUILD)/iamroot.o
 
-ALL_OBJS := $(TOP_OBJ) $(CORE_OBJS) $(CFF_OBJS) $(DP_OBJS)
+ALL_OBJS := $(TOP_OBJ) $(CORE_OBJS) $(CFF_OBJS) $(DP_OBJS) $(EB_OBJS)
 
 .PHONY: all clean debug static help