[tschm]

Fixes the eight points of the second-round editor's review of the constrained-LASSO note (after #68). These are text and layout only: no code or numbers change. It also adds a "When to use which encoding" box.

1. Section 5, "Three independent path algorithms": all three trace the CLA's path once started at the exact first knot, up to the ridge two of them add. As shipped, Gaines et al.'s own start puts it off the path, as the next paragraph already says.
2. Section 1: "There are two, and both are needed" contradicted Appendix B, where the relaxed penalty form reproduces every zero sum. It now reads: the penalty form is the general one, and the budget form the direct one for homogeneous constraints.
3. Section 3, "The start": the starting linear program now includes the rows CSz ≤ h. With some h_r < 0 they move the start off z = 0 (the Floor case in Section 6).
4. Section 2: "a standard extension" now has a source. An inequality row is an equality row with a nonnegative slack, so it fits Markowitz's (1956) form, and cvxcla handles it directly.
5. Scale: the cost ratios are "the one set of results" the script does not write. Problem settings and constants quoted from other packages are typed by hand, and that's fine.
6. Section 6: "only the largest zero sum needed a retry" now says where it comes from: cvxcla 2.6.0, which tried only the first relaxation.
7. Section 1: "This note shows that it does" gains the qualifier the abstract and conclusion use: "or stops with an error where its arithmetic cannot be trusted".
8. Layout: Tables 3–5 follow the Section 5 paragraphs that cite them (pages 10–11) instead of landing in Section 6.

"When to use which encoding" box

A boxed summary at the end of Section 6, styled like Algorithm 1 and modelled on the companion LASSO note's "When to use it". cvxcla.Lasso makes the choice itself; the box says what it picks for which constraints, and what each choice costs:

• Budget form, one run: homogeneous equality rows, with signs at most.
• Penalty form, one run: any nondegenerate start, i.e. signs alone, caps, slack rows, a pinned fit, sum to one, or a floor.
• Penalty form, two or more relaxed runs plus a certificate: homogeneous rows together with caps or inequality rows.
• Either form with p > n: exact on every such problem in the note.
• Two nearly identical columns: the CLA stops with an error.

Builds to 18 pages with no LaTeX warnings.

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