Measure the toolkit on a real Flutter target and correct what it claimed

Ran the scripts against a real Flutter AOT / multi-dex / 36-.so APK (Dart 3.6.0,
com.tingfeng.tool) and recorded what each one actually did. Two of them were wrong
in the direction that reads as a target finding, one Coverage claim overstated what
ships, and four documentation statements were false.

Fixed:

  dart_pprefs.py decoded only the general-purpose register file, so `ldr dN,[x27,#imm]`
  (0xFD400000) was never matched and every double constant read from the object pool
  was dropped -- 302 pool offsets and 1802 sites on this sample, one of them with 150
  references that would have been reported as zero. The documented advice is to count
  references before editing a shared constant, so a one-sided quiet gap here produces
  exactly the wrong decision. Now covers both register files; a purpose-written
  arbiter agrees with it to 0/0 across .text, against 0/302 before.

Documented but deliberately not fixed, because a fix would not have been run:

  elf_plt.py misses the last PLT stub slot (`off < fsz - 16`), which on libloader.so
  turned a real, called import (dl_iterate_phdr) into "not a resolved stub".
  find_refs.py advertises dex-directory input but iter_files() accepts only .smali,
  so it answers "no references" with exit 0 for input it never read.
  so_constpatch.py's rebuild drops the zip `extra` field and destroys 4 KB alignment.
  Each has its root cause and fix sketch recorded.

Documentation corrections in dart-aot.md:

  blutter's asm/ does contain full instruction listings with pool annotations -- the
  file said to ignore it, and it is the richest artifact in the chain.
  The first build costs ~78 s, not "tens of minutes"; MSVC 19.34 suffices, not VS 2022.
  The file-PP offset mapping is not recoverable from the binary (4241 shared strings,
  4237 distinct deltas), so a snapshot-decoding front end is a dependency, now stated.
  Documented aotopsy as the no-toolchain route, and the trap that its version label is
  a structural profile name (it says 3.6.2 for a 3.6.0 snapshot).

Coverage now separates what was measured from what is inferred, names blutter/aotopsy
as a prerequisite instead of implying the pool decodes itself, lists the scripts this
pass did not run, and says plainly that the packer / VMP / integrity-check scenarios
were not exercised at all.

Added hand-off points for JNI, dex-observed hardening, and the existing native boundary
documents, plus docs/verification-jiongnew/ -- the evidence record, including the four
gate outputs verbatim. No second skill: the gap is one front-end dependency, not a
subject area, and relocating Flutter docs would not have supplied it.

docs/verification-jiongnew/README.md

@@ -0,0 +1,29 @@
+# jiongnew.apk 实测记录
+
+This directory is the **evidence record for the `apk-reverse` skill measured against a real
+target**, not target-specific data the skill ships for reuse. It exists so the Coverage
+statement in `SKILL.md` can be checked against the runs behind it, and so a later reader can
+tell which claims were *observed*, which were *inferred*, and which are still *unverified*.
+
+Target: `jiongnew.apk` — Flutter AOT, 4 dex, 36 native libraries, no packer.
+sha256 `0C2B063E6D1A3BD05777611ABF2F1A64056E290E4F6728C1B12DC202747DC645`, 74,394,920 B, 1,982 entries.
+
+The APK itself is **not** in this repository (`.gitignore` excludes `*.apk`).
+
+## Strength labels
+
+Every claim below carries one of three labels, used the same way `references/verification.md`
+uses them:
+
+- **observed** — reproduced here, with the exact command and its output.
+- **inferred** — follows from observed facts, but the step itself was not executed.
+- **unverified** — assumed or reported by a tool and not independently confirmed.
+
+## Index
+
+| File | Covers |
+|---|---|
+| `TOOL-VERDICTS.md` | One verdict per tested script, with the independent cross-check behind it |
+| `TARGET-FACTS.md` | What the target is: manifest, dex, natives, assets, versions, and what it does at launch |
+| `FINDINGS.md` | Findings about the skill itself: defects, contradictions, boundary evidence |
+| `REPO-DECISIONS.md` | What changed in the repo as a result, and what deliberately did not |