pack2theroot (CVE-2026-41651) + --auto accuracy work

Adds the third ported module — Pack2TheRoot, a userspace PackageKit
D-Bus TOCTOU LPE — and spends real effort hardening --auto so its
detect step gives an accurate, robust verdict before deploying.

pack2theroot (CVE-2026-41651):
- Ported from the public Vozec PoC
  (github.com/Vozec/CVE-2026-41651). Original disclosure by the
  Deutsche Telekom security team.
- Two back-to-back InstallFiles D-Bus calls (SIMULATE then NONE)
  overwrite the cached transaction flags between polkit auth and
  dispatch. GLib priority ordering makes the overwrite deterministic,
  not a timing race; postinst of the malicious .deb drops a SUID bash
  in /tmp.
- detect() reads PackageKit's VersionMajor/Minor/Micro directly over
  D-Bus and compares against the pinned fix release 1.3.5 (commit
  76cfb675). This is a high-confidence verdict, not precondition-only.
- Debian-family only (PoC builds its own .deb in pure C; ar/ustar/
  gzip-stored inline). Cleanup removes /tmp .debs + best-effort
  unlinks /tmp/.suid_bash + sudo -n dpkg -r the staging packages.
- Adds an optional GLib/GIO build dependency. The top-level Makefile
  autodetects via `pkg-config gio-2.0`; when absent the module
  compiles as a stub returning PRECOND_FAIL.
- Embedded auditd + sigma rules cover the file-side footprint
  (/tmp/.suid_bash, /tmp/.pk-*.deb, non-root dpkg/apt execve).

--auto accuracy improvements:
- Auto-enables --active before the scan. Per-module sentinel probes
  (page-cache /tmp files, fork-isolated namespace mounts) turn
  version-only checks into definitive verdicts, so silent distro
  backports don't fool the scan and --auto won't pick blind on
  TEST_ERROR.
- Per-module verdict printing — every module's result is shown
  (VULNERABLE / patched / precondition / indeterminate), not just
  VULNERABLE rows. Operator sees the full picture.
- Scan-end summary line: "N vulnerable, M patched/n.a., K
  precondition-fail, L indeterminate" with a separate callout when
  modules crashed.
- Distro fingerprint added to the auto banner (ID + VERSION_ID from
  /etc/os-release alongside kernel/arch).
- Fork-isolated detect() — each detector runs in a child process so
  a SIGILL/SIGSEGV in one module's probe is contained and the scan
  continues. Surfaced live while testing: entrybleed's prefetchnta
  KASLR sweep SIGILLs on emulated CPUs (linuxkit on darwin); without
  isolation the whole --auto died at module 7 of 31. With isolation
  the scan reports "detect() crashed (signal 4) — continuing" and
  finishes cleanly.

module_safety_rank additions:
- pack2theroot: 95 (userspace D-Bus TOCTOU; dpkg + /tmp SUID footprint
  — clean but heavier than pwnkit's gconv-modules-only path).
- dirtydecrypt / fragnesia: 86 (page-cache writes; one step below the
  verified copy_fail/dirty_frag family at 88 to prefer verified
  modules when both apply).

Docs:
- README badge / tagline / tier table / ⚪ block / example output /
  v0.5.0 status — all updated to "28 verified + 3 ported".
- CVES.md counts line, the ported-modules note (now calling out
  pack2theroot's high-confidence detect vs. precondition-only for
  the page-cache pair), inventory row, operations table row.
- ROADMAP Phase 7+: pack2theroot moved out of carry-overs into the
  "landed (ported, pending VM verification)" group; added a new
  "--auto accuracy work" subsection documenting the dispatcher
  hardening landed in this commit.
- docs/index.html: scanning-count example bumped to 31, status line
  updated to mention 3 ported modules.

Build verification: full `make clean && make` in `docker gcc:latest`
with libglib2.0-dev installed: links into a 31-module skeletonkey
ELF (413KB), `--list` shows all modules including pack2theroot,
`--detect-rules --format=auditd` emits the new pack2theroot section,
`--auto --i-know --no-shell` exercises the new banner + active
probes + verdict table + fork isolation + scan summary end-to-end.
Only build warning is the pre-existing
`-Wunterminated-string-initialization` in dirty_pipe (not introduced
here).

Makefile

@@ -152,17 +152,39 @@ FGN_DIR  := modules/fragnesia_cve_2026_46300
 FGN_SRCS := $(FGN_DIR)/skeletonkey_modules.c
 FGN_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(FGN_SRCS))
 
+# Family: pack2theroot (CVE-2026-41651) — PackageKit TOCTOU userspace LPE.
+# Needs GLib/GIO for D-Bus; the build autodetects via `pkg-config gio-2.0`.
+# When absent (e.g. no libglib2.0-dev on the build host), the module
+# compiles as a stub that returns PRECOND_FAIL with a hint to install
+# the dev package and rebuild.
+P2TR_DIR  := modules/pack2theroot_cve_2026_41651
+P2TR_SRCS := $(P2TR_DIR)/skeletonkey_modules.c
+P2TR_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(P2TR_SRCS))
+
+P2TR_GIO_OK := $(shell pkg-config --exists gio-2.0 2>/dev/null && echo 1 || echo 0)
+ifeq ($(P2TR_GIO_OK),1)
+  P2TR_CFLAGS := $(shell pkg-config --cflags gio-2.0) -DPACK2TR_HAVE_GIO
+  P2TR_LIBS   := $(shell pkg-config --libs gio-2.0)
+else
+  P2TR_CFLAGS :=
+  P2TR_LIBS   :=
+endif
+
+# Per-object CFLAGS for the pack2theroot translation unit (GLib include
+# paths). Target-specific vars are scoped to this object's recipe.
+$(P2TR_OBJS): CFLAGS += $(P2TR_CFLAGS)
+
 # Top-level dispatcher
 TOP_OBJ  := $(BUILD)/skeletonkey.o
 
-ALL_OBJS := $(TOP_OBJ) $(CORE_OBJS) $(CFF_OBJS) $(DP_OBJS) $(EB_OBJS) $(PK_OBJS) $(NFT_OBJS) $(OVL_OBJS) $(CR4_OBJS) $(DCOW_OBJS) $(PTM_OBJS) $(NXC_OBJS) $(AFP_OBJS) $(FUL_OBJS) $(STR_OBJS) $(AFP2_OBJS) $(CRA_OBJS) $(OSU_OBJS) $(NSU_OBJS) $(AUG_OBJS) $(NFD_OBJS) $(NPL_OBJS) $(SAM_OBJS) $(SEQ_OBJS) $(SUE_OBJS) $(VMW_OBJS) $(DDC_OBJS) $(FGN_OBJS)
+ALL_OBJS := $(TOP_OBJ) $(CORE_OBJS) $(CFF_OBJS) $(DP_OBJS) $(EB_OBJS) $(PK_OBJS) $(NFT_OBJS) $(OVL_OBJS) $(CR4_OBJS) $(DCOW_OBJS) $(PTM_OBJS) $(NXC_OBJS) $(AFP_OBJS) $(FUL_OBJS) $(STR_OBJS) $(AFP2_OBJS) $(CRA_OBJS) $(OSU_OBJS) $(NSU_OBJS) $(AUG_OBJS) $(NFD_OBJS) $(NPL_OBJS) $(SAM_OBJS) $(SEQ_OBJS) $(SUE_OBJS) $(VMW_OBJS) $(DDC_OBJS) $(FGN_OBJS) $(P2TR_OBJS)
 
 .PHONY: all clean debug static help
 
 all: $(BIN)
 
 $(BIN): $(ALL_OBJS)
-	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ -lpthread
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ -lpthread $(P2TR_LIBS)
 
 # Generic compile: any .c → corresponding .o under build/
 $(BUILD)/%.o: %.c