fix: add CV Page 1 rule — first bullet must be 2L

A 3L first bullet in the first experience position overflows page 1,
wasting prime real estate. Updated resume_reference.md (Page Fill
Budgets), critical_rules.md (Budget Reminder), cv_template.tex
(comment block), and /make-resume SKILL.md (Phase 1 checklist).

Co-Authored-By: Akhil Peeketi <akhil@lanl.gov>

resume_builder/templates/cv_template.tex

@@ -8,6 +8,10 @@
 % 2. Fill ALL FIXED sections with your actual content
 % 3. Leave [GENERATE: ...] markers -- Claude fills these per JD
 % 4. After setup, compile and calibrate the line budget below
+%
+% PAGE 1 RULE: First bullet of first experience MUST be 2L (not 3L).
+% A 3L first bullet overflows page 1. If top achievement needs 3L,
+% make it bullet #2 and lead with a strong 2L bullet.
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 \documentclass{cv}