Add patterns 36-38: population claims, hedge-and-overstate, unearned superlatives

[axjasf]

Three patterns for a common family of verifiability tells, plus two additions to the section 7 word list. All examples follow the house format and stay in neutral, non-domain prose.

36. Empty population claims. Unverifiable counts like "almost no one measures this" or the relative-clause variant "a problem nobody named". These sound empirical but lean on evidence the writer never gathered. This sits next to section 5 (vague sources) but stays distinct: section 5 is about missing attribution, this one is about asserting a distribution the writer cannot defend.

37. Hedge then overstate. A soft opener paired with a strong claim in one sentence ("It's worth noting that X is the single most important..."). The hedge gives room to retreat while the superlative does the asserting, so the reader has to guess how much is meant.

38. Unearned superlatives. "the most important thing", "the single source of truth", where the ranking is not established nearby or attributed. Keep when defended or quoted; otherwise demote or drop.

Section 7 additions. Passive-narrator words (flagged, surfaced, noted) that point without naming the actor, and filler adjectives (significant, substantive, substantial) that claim importance without backing it.

Version bumped to 2.12.0; README pattern tables and changelog updated. scripts/validate-package.py passes.

[axjasf]

Splitting this into focused single-pattern PRs so each can be reviewed independently: unearned superlatives and hedge-then-overstate. The section 36 population-claims pattern overlaps with #246/#244, so I am holding it back rather than competing for the slot.