Multi-capability showcase: doc-approval.pipeline workflow (extract → analyze → recommend)

[enricopiovesan]

Summary

Define doc-approval.pipeline chaining extract → analyze → recommend WASM capabilities for the doc-approval reference app on all platforms.

Why

Second domain app proves the embedded + multi-capability pattern is reusable, not traverse-starter-specific.

Depends on

• Traverse #538 (doc-approval.extract)
• New doc-approval.recommend capability in Traverse
• manifests/doc-approval/ (see companion issue)

Blocked by

• Traverse #553
• Traverse #538

Definition of Done

• Workflow + manifests authored
• All seven doc-approval clients execute pipeline and render runtime output
• Approver surface remains out of scope (Phase 1 submitter only)

Validation

• Dev sidecar: register → execute pipeline → analysis + recommendation fields render