[vEnhance]

Closes #60.

Proofread src/minmax.typ, src/regions.typ, src/opt.typ, src/mt2.typ (the files included under Part Foxtrot). Found and fixed:

• src/minmax.typ: "draw in green" → "drawn in green", and "An critical inflection point" → "A critical inflection point", to match the parallel "drawn in ..." bullet list.
• src/minmax.typ: broken punctuation in the "taking square roots of both sides, That is, ..." tip, joined into one sentence.
• src/minmax.typ: in the critical-points sample for $f(x,y,z) = z(x-y)(y-z) - 2xz$, a sign flip in the substitution step "$x = 2(z+2) + z = z+4$" (should be "$- z$"); the final answer $z+4$ was already correct, only the intermediate algebra step was wrong.
• src/regions.typ: stray $ placement in "$(1,0)$ and $(0,1$)." → "$(0,1)$".
• src/regions.typ: subject-verb agreement, "the boundary ... are the four sides" → "is the four sides".
• src/regions.typ: in the 3D regions table, the limit-cases entry for $x^2+y^2+z^2=1$, $x,y,z>0$ incorrectly listed boundary-style points "$(1,0)$ and $(0,1)$" (which aren't even valid 3-variable points); replaced with the correct limit cases "$x \to 0^+$ or $y \to 0^+$ or $z \to 0^+$", consistent with the analogous row in the 2D table.
• src/opt.typ: missing "$g$" in "$ (x,y,z) = x+2y+3z=4$" (the constraint function), should be "$g(x,y,z) = ...$".
• src/opt.typ: duplicated "The first expression" in a footnote where the second sentence should refer to "the second expression".
• src/opt.typ: "doesn't like on the constraint" → "doesn't lie on the constraint".
• src/opt.typ: in the $x^3+3y^3+4z^3$ Lagrange multiplier example, the total LM-critical point count was miscounted as 26; since the per-case sign choices are tied together by ratios like $z = 4x$ (not independent), the correct total is 14, not 26. This is also confirmed by the next sentence, which says the count "reduces ... to just 7" by halving via the ±-symmetry ($14/2 = 7$, but $26/2 = 13$ would be inconsistent).

No large mathematical errors were found beyond the miscounted LM-critical points above; src/mt2.typ (the practice midterm problem statements) had no issues.

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