Add SDLC pipeline Mermaid diagram

Visualizes both pipelines (A: plugin, B: infra), the board approval
gate, PR review SLA, handoff protocol, and issue status lifecycle.

Co-Authored-By: Paperclip <noreply@paperclip.ing>
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# SDLC Pipeline Diagram
## Full Lifecycle
```mermaid
flowchart TD
subgraph Origin["Task Origin"]
GH["GitHub Issue"]
PP["Paperclip Issue"]
end
subgraph Approval["Board Gate"]
BA{"Board Approval<br/>Required?"}
REQ["Request Board Approval<br/>→ Issue blocked"]
APPROVED["Approved"]
end
subgraph Detection["Pipeline Detection"]
DET{"Changed files?"}
PA["Pipeline A<br/>Plugin / Feature"]
PB["Pipeline B<br/>Infrastructure"]
end
subgraph PipelineA["Pipeline A: Plugin / Feature Changes"]
direction TB
A_ENG["Engineer writes code<br/>(Gandalf)"]
A_PR["Create PR → main<br/>cc @cpfarhood"]
A_CI{"CI Passes?"}
A_UAT["UAT Review<br/>(Pixel Patty)<br/>E2E browser testing"]
A_UAT_PASS{"UAT Approved?"}
A_QA["QA Review<br/>(Regression Regina)<br/>Test coverage, regressions"]
A_QA_PASS{"QA Approved?"}
A_CTO["CTO Review<br/>(Null Pointer Nancy)<br/>Architecture, security"]
A_CTO_PASS{"CTO Approved?"}
A_CEO["CEO Merge<br/>(Countess)"]
end
subgraph PipelineB["Pipeline B: Infrastructure Changes"]
direction TB
B_ENG["Engineer writes code<br/>(Gandalf / Hugh)"]
B_PR["Create PR → main<br/>cc @cpfarhood"]
B_CI{"CI Passes?"}
B_QA["QA Review<br/>(Regression Regina)"]
B_QA_PASS{"QA Approved?"}
B_CTO["CTO Review<br/>(Null Pointer Nancy)"]
B_CTO_PASS{"CTO Approved?"}
B_CEO["CEO Merge<br/>(Countess)"]
end
subgraph Result["Outcome"]
MERGED["Merged to main<br/>✓ Production"]
RETURNED["Returned to Engineer<br/>Fix and resubmit"]
end
%% Origin routing
GH --> BA
PP --> DET
BA -->|"originKind: github"| REQ
REQ -->|"PAPERCLIP_APPROVAL_STATUS"| APPROVED
BA -->|"originKind: other"| DET
APPROVED --> DET
%% Pipeline detection
DET -->|"headlamp-*-plugin/ code"| PA
DET -->|".github/, infra/, org/"| PB
%% Pipeline A flow
PA --> A_ENG --> A_PR --> A_CI
A_CI -->|"Pass"| A_UAT
A_CI -->|"Fail"| RETURNED
A_UAT --> A_UAT_PASS
A_UAT_PASS -->|"Pass"| A_QA
A_UAT_PASS -->|"Fail"| RETURNED
A_QA --> A_QA_PASS
A_QA_PASS -->|"Pass"| A_CTO
A_QA_PASS -->|"Fail"| RETURNED
A_CTO --> A_CTO_PASS
A_CTO_PASS -->|"Pass"| A_CEO
A_CTO_PASS -->|"Fail — CEO rejection"| A_CTO
A_CTO_PASS -->|"Fail — other"| RETURNED
A_CEO --> MERGED
%% Pipeline B flow
PB --> B_ENG --> B_PR --> B_CI
B_CI -->|"Pass"| B_QA
B_CI -->|"Fail"| RETURNED
B_QA --> B_QA_PASS
B_QA_PASS -->|"Pass"| B_CTO
B_QA_PASS -->|"Fail"| RETURNED
B_CTO --> B_CTO_PASS
B_CTO_PASS -->|"Pass"| B_CEO
B_CTO_PASS -->|"Fail — CEO rejection"| B_CTO
B_CTO_PASS -->|"Fail — other"| RETURNED
B_CEO --> MERGED
RETURNED -->|"Fix and resubmit"| A_PR
RETURNED -->|"Fix and resubmit"| B_PR
%% Styling
classDef gate fill:#f9e4e4,stroke:#c0392b,color:#000
classDef pass fill:#e4f9e4,stroke:#27ae60,color:#000
classDef agent fill:#e4e9f9,stroke:#2980b9,color:#000
classDef decision fill:#fef9e7,stroke:#f39c12,color:#000
class BA,A_CI,A_UAT_PASS,A_QA_PASS,A_CTO_PASS,B_CI,B_QA_PASS,B_CTO_PASS,DET decision
class A_UAT,A_QA,A_CTO,B_QA,B_CTO gate
class MERGED pass
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
sequenceDiagram
participant Src as Source Agent
participant API as Paperclip API
participant Tgt as Target Agent
Src->>API: PATCH /issues/{id}<br/>assigneeAgentId: target
Src->>API: PATCH /issues/{id}<br/>status: "todo"
Note over Src,API: Never use "in_review" —<br/>it won't trigger inbox
Src->>API: POST /issues/{id}/release<br/>X-Paperclip-Run-Id header
API-->>Tgt: Inbox wake
Tgt->>API: POST /issues/{id}/checkout
Tgt->>Tgt: Begin work
```
## Issue Status Lifecycle
```mermaid
stateDiagram-v2
[*] --> backlog: Created (unscheduled)
[*] --> todo: Created (ready)
backlog --> todo: Scheduled
todo --> in_progress: Checkout
in_progress --> in_review: Awaiting feedback
in_progress --> blocked: External blocker
in_progress --> done: Work complete
in_review --> in_progress: Feedback received
blocked --> in_progress: Unblocked
in_progress --> cancelled: Abandoned
todo --> cancelled: Abandoned
backlog --> cancelled: Abandoned
```