fix(linkedin-studio): S2 harden post — Step-5 buzzword gate + scorecard hook-band consistency

P4 close-out (4 edits / 2 files · lint 81/0 · counts 29/19/26/6):
- post.md Step 5: add no-buzzword checklist line (was missing; banned list = content rule #4)
- quality-scorecard.md l.32/114: one-sided "140" hook bound -> "110-140" (matches l.128, resolves self-contradiction)
- quality-scorecard.md: add no-buzzword line to Pre-Publish Basic Checklist

Shared scorecard fix benefits 8 consumers; only post hardened this session (react/batch/video/pipeline get own EVALUATE in S3/S5/S6/S8). Local-only per push policy.

assets/checklists/quality-scorecard.md

@@ -29,7 +29,7 @@ Rate each criterion 0-3:
 
 | Criterion | Score | Notes |
 |-----------|-------|-------|
-| Works in 140 characters | /3 | Mobile threshold |
+| Works in 110-140 characters | /3 | Mobile band (floor + ceiling) |
 | Creates curiosity gap | /3 | Click-through driver |
 | Promises clear value | /3 | Worth reading? |
 | **Subtotal** | /9 x 2 = **/18** | |
@@ -111,7 +111,7 @@ Before posting, verify your profile supports the post's topic (topic/interest re
 For quick posts, use this simplified check:
 
 1. On-topic for my expertise? (Y/N)
-2. Hook works in 140 chars? (Y/N)
+2. Hook works in 110-140 chars? (Y/N)
 3. Clear value delivered? (Y/N)
 4. Ends with engagement prompt? (Y/N)
 5. No external links in body? (Y/N)
@@ -129,6 +129,7 @@ Before finalizing any post, verify:
 - [ ] Character count within optimal range
 - [ ] Short paragraphs with white space
 - [ ] Tone is authentic, not corporate
+- [ ] No corporate buzzwords (leverage, synergy, paradigm shift, thought leader, disruptive, value proposition, ecosystem, holistic approach)
 - [ ] Provides genuine value to readers
 - [ ] CTA is specific and natural
 - [ ] Passes the "mobile test" (readable on phone)