docs: finish the coherence pass (guided tour residue + logo/abstract-syntax line width)

[ocots]

Follow-up to the E4 coherence pass (#917 / #918)

PR #918 (line wrapping, F16) explicitly deferred getting-started/guided-tour.md to Phase E5 because it is Literate-generated. Phase E5 (#920) made the tour execute but did not carry over the coherence-pass fixes, so two sub-items of the runbook's "coherence pass" step were left open. This closes them, plus two files that were touched after the wrap pass.

docs/src-literate/guided-tour.jl (source; .md / .ipynb / .jl are regenerated at build, not tracked)

• F16 — six lines over 75 characters inside @example blocks:
  • constraint!(pre, :boundary; …), the two println("Ipopt/MadNLP …"), plot!(plt_bang[1], …) wrapped one group per line with a trailing comma;
  • two over-long trailing comments trimmed (has_abstract_definition, using OrdinaryDiffEqTsit5, and a ## note).
• F25 — solve(prob; show_trace=Val(true)) → NonlinearSolve.solve(prob; …). This was the last shooting call site still calling solve unqualified after using NonlinearSolve; all examples/*.md and flows/shooting.md were already qualified.

docs/src/examples/logo.md

Four lines at 76–81 characters (post-dating the #918 wrap pass): circle(r) = […] and ax = Axis(…) wrapped; two padded comments narrowed.

docs/src/modelling/abstract-syntax.md

One 77-character comment line in an @example block trimmed (77 → 62).

Verification

• Meta.parseall on the Literate source: OK.
• Literate regeneration of guided-tour.md: 0 lines over 75 in @example / @repl / @setup blocks (was 6).
• logo.md @example blocks: 5/5 parse clean.

Deliberately not touched

The remaining over-75 lines in fenced blocks are all documented exceptions:

• REPL output (ERROR: / Hint / │ Context boxes) in installation.md, save-load.md, flows/overview.md, migration.md — the exception PR docs: wrap over-long code lines (Phase E4 part 2, F16) #918 already recorded.
• migration.md inert julia fences carrying VitePress [!code error] / [!code warning] / [!code --] markers — introduced later by docs: VitePress code annotations + one mis-rendered list (Phase J) #922 (Phase J); the length comes from comment alignment and the end-of-line markers, not from a wrappable call.

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