docs(voice): scrub prose em-dashes from voice-profile.org

This hygiene sweep covers the profile's prose sections (Problem,
Basis, History, Phase 1 findings, Phase 2 list) where em-dashes had
carried over from the original SKILL.md text. 21 prose em-dashes were
replaced with context-appropriate punctuation (periods, colons,
parentheses, or rewords).

Eight em-dashes are preserved as legitimate exceptions: the literal
symbol reference in §13 Rule, §13 Before example (shows source text
with em-dashes), §36 Before example (felt-experience tic), §38
heading "Terse Cut — Rhetorical Padding" (paired with SKILL.md
heading verbatim), §39 Before example (WARN output format), §40
example dialogue (shows what a kind correction reads like).

The profile now follows its own rule for prose voice. The known
follow-up flagged in 10d0bc1's commit message is closed.

0 files changed, 0 insertions, 0 deletions