[vEnhance]

Closes #68.

Proofread src/flux.typ, src/divthm.typ, src/badstokes.typ (the files included under Part Juliett). Found and fixed:

• src/flux.typ: incomplete sentence "explain what the adjective 'oriented'." was missing "means".
• src/flux.typ: in the sphere-orientation example, "either points straight towards the center of from $P$, or away from the center of $P$" was garbled; simplified to "either points straight towards the center, or away from the center."
• src/flux.typ: the same example parametrizes "the hemisphere" (sphere with $z>0$) but gave the bounds as $0 <= phi <= pi$ (the whole sphere) in both orderings; corrected to $0 <= phi <= pi/2$.
• src/flux.typ: in the $z = x^3+y^3$ flux sample, the displayed equation vec(3x^2,3y^2,-1) = vec(-3x^2,-3y^2,1) falsely equated a vector with its own negation; removed the erroneous first (negated) vector, since the dot product computed immediately afterward uses the non-negated one.
• src/flux.typ: in the cylinder flux sample, 490 dot (3 pi + 8 pi) should be 490 dot (3 pi + 5 pi) to match $int cos^2 = int sin^2 = pi$ (the final boxed answer of $3920 pi$ was already correct).
• src/flux.typ: in the spherical-coordinates hemisphere sample, a displayed integral dropped the $cos phi$ factor present in the line immediately before and the line immediately after it.
• src/flux.typ: in the point-mass-gravity flux sample, the dot-product line used $bf(F)$ instead of $bf(G)$ (the vector field is named $G$ in this example), and the general surface-area formula was given as "$R^2 pi$" instead of the correct "$4 R^2 pi$" (the actual computation in the same sample already used the correct $4 R^2 pi$).
• src/divthm.typ: a missing \ line break caused two rows of an aligned equation to run together.
• src/divthm.typ: moved a stray period to match the #boxed[...]. #qedhere convention used everywhere else in the file.
• src/badstokes.typ: the classical Stokes' theorem statement said "Suppose $cal(S)$ is the boundary of an oriented surface $cal(S)$", which is self-referential nonsense; corrected to "Suppose $cal(C)$ is the boundary of an oriented surface $cal(S)$", consistent with the definition of compatible orientations given just above it.

No large mathematical errors were found beyond the sign/factor slips above.

Test plan

• Installed typst 0.15.0 plus the @local/evan:1.0.0 package (from vEnhance/dotfiles) and the required @preview deps (gentle-clues, linguify), generated placeholder SVGs standing in for the Asymptote figures (asy isn't available in this environment), then ran typst compile lamv.typ end-to-end — compiles cleanly with no errors.
• Ran codespell on the three changed files — no issues.

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