docs(wsp): add WSP 109 FoundUp Onboarding Intake Protocol

Promote module-level onboarding protocol to formal WSP after Shield
validation (PR #717 merged).

WSP 109 defines how raw 012 ideas become architect-ready FoundUp
intake packets. It hands off to WRE for orchestration.

Core rule:
  WSP 109 = intake
  WRE = orchestration
  Architect = routing authority

Output packet contracts:
  - OUTCOME.md
  - SOLUTION.md
  - PAIN.md
  - POC_SCOPE.md
  - PROTOTYPE_GATE.md
  - SKILLS_MAP.md
  - FOUNDUP_MANIFEST_DRAFT.md

Addenda:
  - A: WRE Orchestration Binding (does not replace WRE)
  - B: AutoPost/Sleeve Reuse Boundary
  - C: FoundUp Mall/Exchange Read-Model Boundary
  - D: WSP 95 SKILLz Boundary (skills mapped, not created)

Number collision resolved:
  - WSP 109 assigned to FoundUp Onboarding Intake
  - Prompt Security Gating (prior proposal) remains unassigned

Mirror sync: Framework and Knowledge files are byte-identical
Master indexes: WSP 109 highest, WSP 110 next available

WSP_97 Truth Boundary: 25/25 YES
- No runtime code mutation
- No registry/catalog mutation
- No skillz creation
- Does not replace WRE

Predecessor: PR #717 (Shield onboarding)
Slice: WSP_109_FOUNDUP_ONBOARDING_INTAKE_PROTOCOL_PHASE1

Worker-Lane: W9
Slice: WSP_109_FOUNDUP_ONBOARDING_INTAKE_PROTOCOL_PHASE1

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Foundups Agent