Remove SLA section from SDLC skill and diagram

SLA timelines are meaningless to agents operating in heartbeats.
Removed the 48-hour PR review SLA from SKILL.md and the SLA
gantt chart from sdlc-diagram.md.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

skills/sdlc/SKILL.md

@@ -67,16 +67,6 @@ Requires **3 approving GitHub reviews** before the CEO merges:
 
 **Review order is mandatory: CI → UAT → QA → CTO → CEO merge.** Each stage gates the next. No agent merges their own PRs.
 
-## 48-Hour PR Review SLA
-
-Every open PR must receive its first review within 48 hours. Each reviewer's SLA starts when the previous stage approves.
-
-- **24h:** CEO tags reviewer and surfaces PR in daily status
-- **48h:** SLA violation; CEO escalates to reviewer's manager
-- **72h+:** Critical-path PRs block the next release
-
-Reviewers who cannot meet SLA must hand off within the window. No exceptions without board approval.
-
 ## Pipeline
 
 ### Pipeline A: Plugin/Feature Changes

skills/sdlc/sdlc-diagram.md

@@ -108,21 +108,6 @@ flowchart TD
     class A_ENG,B_ENG,A_CEO,B_CEO agent
 ```
 
-## PR Review SLA
-
-```mermaid
-gantt
-    title PR Review SLA Timeline (per stage)
-    dateFormat X
-    axisFormat %d h
-
-    section SLA Windows
-    Normal review window   :done, 0, 24
-    CEO escalation at 24h  :active, 24, 48
-    SLA violation at 48h   :crit, 48, 72
-    Release blocker at 72h :crit, 72, 96
-```
-
 ## Handoff Protocol
 
 ```mermaid