feat: add AI fingerprint avoidance rules and fix em-dash patterns

- Add ai_fingerprint_rules.md with banned words, structural rules, and
  12-item post-gen checklist
- Fix Fellowships/Honors template format: --- to period separator
- Fix Publications under-review template format
- Update all 4 skills to load fingerprint rules during generation
- Add AI scan section to critique framework
- Update resume_reference and cl_reference with em-dash limits
- Reduce em-dashes in example files

Co-Authored-By: Akhil Peeketi <peeketiakhilreddy@gmail.com>

resume_builder/reference/cl_reference.md

@@ -89,3 +89,4 @@
 - No credential dump in closing paragraph
 - No repeating resume bullets verbatim — CL deepens, doesn't duplicate
 - Limit quantified claims to 3-5 per CL
+- **Em-dashes in CLs:** Max 2 per document. CLs are prose-heavy and em-dashes compound quickly. Use commas for parenthetical asides, colons for elaborations, periods for new sentences. Paired em-dashes (X --- detail --- Y) should use commas or parentheses instead.

resume_builder/reference/critique_framework.md

@@ -437,6 +437,18 @@ If a cover letter was generated in the same session, run all checks below. Detec
 
 ---
 
+## Part 6G: AI Fingerprint Scan
+
+Run the 12-item checklist from `resume_builder/support/ai_fingerprint_rules.md` Section 6. Key scans:
+- Count em-dashes (`---`) in full document — flag if >2
+- Scan all bullet endings for -ing analysis phrases (the #1 structural AI marker)
+- Search for any Tier 1 banned word (delve, tapestry, multifaceted, pivotal, etc.)
+- Check CL for generic opener and uniform sentence length
+
+Any failure is a Tier 1 fix in Part 4.
+
+---
+
 ## Part 7: Post-Generation Verification
 
 Final mechanical checklist. Run AFTER all other critique parts. These are pass/fail checks, not scored dimensions.

resume_builder/reference/resume_reference.md

@@ -237,6 +237,8 @@ Run this checklist after compile gate passes, before critique. Also used as Part
 Before presenting final output, verify:
 
 - [ ] All mechanical checks pass (chars, orphans, page fill, no submitted, sequences, variants)
+- [ ] Em-dash count: max 2 per document (resume or CL). Fellowships items use `. ` not `---`.
+- [ ] No -ing analysis endings on bullets ("...advancing the field", "...contributing to Y"). Restructure to end with a concrete result or metric.
 - [ ] All content checks pass (ATS, terms, inflation, provenance, pubs, cover letter)
 - [ ] All narrative checks pass (scan test, per-position flow, cross-position arc, CV sub-headers)
 - [ ] Company/institution name spelled correctly throughout