fix(expand,setup): append behavioral findings to sections 02-behavioral-profile.md actually has (#520)

Both commands told the model to add to "Strongest Behavioral Traits" and
"How I Work Best" / "How [Candidate] Works Best" while also saying "match
existing structure", but the shipped file's headings are "Strongest
Behaviors" and "How You Work Best", so an inferred trait either opened a
duplicate near-identical section or was dropped.

The companion to #519, which fixed the same drift in /reset's skeleton.
Both bullets now name the shipped headings, and a derived test in each
command's suite reads the quoted section names and requires each to be a
## heading of the shipped file; both fail on master.

.claude/commands/expand.md

@@ -189,7 +189,7 @@ Apply only the confirmed items. Use the Edit tool to add to the relevant section
 For each addition, add a brief source annotation in a comment or parenthetical: *(Coursera — Deep Learning Specialisation)*, *(GitHub — project-name)*, etc. This makes future `/expand` runs idempotent.
 
 ### Additions to `02-behavioral-profile.md`
-- Soft/behavioral signals → append to the "Strongest Behavioral Traits" or "How I Work Best" section (match existing structure)
+- Soft/behavioral signals → append to the "Strongest Behaviors" or "How You Work Best" section (the shipped file's `##` headings - match existing structure)
 - Always label inferred behavioral additions: *[Inferred from reference letter — Name / review before relying on this]*
 
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