paper v2.36: add \paragraph{} headers throughout §3-§6 for readability

User feedback: "你能不能分点subsection甚至subsubsection？或者至少paragraph。
现在读起来很不顺畅，因为看起来太大块了"

The recent v2.34-v2.35 expansions made several §4 paragraphs very long
and dense. The user asked for visible structure (subsection /
subsubsection / at least paragraph headers).

Added \paragraph{} bold inline headers throughout §3-§6:

§3 (Mode 1):
  - The two parts of Mode 1
  - Falsification chain: four alternative attributions
  - Causal control: removing terminal LayerNorm on the same backbone

§4 (Mode 2):
  - Mode 2 is present even when measurement is meaningful
  - A second metric with different failure modes agrees
  - Per-layer reporting is mandatory: layer-0 dominance
  - Method-dependent severity once Mode 1 is alleviated
  - Three functional metrics rank the methods consistently; cosine disagrees
  - A three-part proposition: observation, inference, mechanism hypothesis
  - Mode 1 may be a downstream symptom of Mode 2
  - Hypothesis status and reporting rule

§5 (Intervention):
  - The penalty rescues the measurement regime
  - Penalty alleviates Mode 2 only partially; the λ sweep separates the modes
  - Capacity-cost control: BP under the same penalty
  - Cross-architecture and depth-sweep evidence

§6 (Protocol):
  - Start from measurement validity
  - Decision value: which diagnostics actually walk back which methods
  - Diagnostic roles and calibration

Each paragraph now has a bold inline header that names what it argues
for, so a reader skimming the §3-§6 mainline can navigate by header
rather than parsing dense prose blocks.

Used \paragraph{} (not \subsection{}) because:
1. \subsection{} would renumber the TOC and add another level of
   heading depth
2. \paragraph{} is the standard LaTeX inline-bold header that's
   visually distinct without breaking the section structure
3. Doesn't affect the figure/table numbering

Page impact: total pages 19 → 20 (paragraph headers add ~1 line per
header). Per the user's relaxed page budget, this is acceptable. §7
still starts on p10, references on p10-12.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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