fix(visual): address PR #48 review comments

- sound-indicator-visual: D-069 → D-033/D-048 color reference, reconcile
  medium range S1 (3-8) vs S7 (3-20) contradiction, split dual values in
  quick-reference table
- entity-color-system: D-046 → D-015 for peripheral rendering, tighten
  cognitive delay wording, add accessibility ticket tracking note
- visual-grammar-v01: dialogue max-width corrected from ~70% to 640px
  per D-076
- the-friend-visual-treatment: D-063 citation title corrected
- tell-visual-expression: soften D-024 attribution (axis, not categories)
- environmental-text-standards: specify tile unit for terminal visibility
- monologue-display-spec: header updated to reflect Sprint 14 inclusion
- CHANGELOG: add entries for all 6 Sprint 14 design docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/design/tell-visual-expression.md

@@ -25,7 +25,7 @@ The tell system (D-024 axis: Tell System) defines behavioral signals that NPCs e
 
 ## 2. Tell Categories and Animation Tier Mapping
 
-D-024 specifies 5 tell categories. Each maps to one or more Tier 2 behavioral expressions (D-047 animation tier system). The mapping is based on what the tell would look like from a top-down view on a character operating in a public space.
+D-024 defines the tell system axis on the NPC model. This spec identifies 5 tell categories derived from the axis. Each maps to one or more Tier 2 behavioral expressions (D-047 animation tier system). The mapping is based on what the tell would look like from a top-down view on a character operating in a public space.
 
 | Tell category | Internal state | Primary Tier 2 behavior | Secondary behavior | Notes |
 |---------------|---------------|------------------------|-------------------|-------|