chore(openspec): archive engineering-docs and phase-2-production-ready changes

- engineering-docs → archive/2026-03-29-engineering-docs (63/63 tasks complete)
- phase-2-production-ready → archive/2026-03-29-phase-2-production-ready (89/89 tasks complete)
- openspec/specs/ synced with all Phase 1 + Phase 2 + engineering-docs capabilities (22 specs total)

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

openspec/changes/archive/2026-03-29-engineering-docs/specs/engineering-overview/spec.md

@@ -0,0 +1,28 @@
+## ADDED Requirements
+
+### Requirement: Company and product overview document
+The system SHALL include a document (`docs/engineering/01-overview.md`) that explains SentryAgent.ai's mission, the AgentIdP product, target users, and why the product exists — providing new engineers with business and product context before they read any technical content.
+
+#### Scenario: Mission and vision covered
+- **WHEN** a new engineer reads 01-overview.md
+- **THEN** they SHALL understand what SentryAgent.ai builds, why it exists, and what problem it solves for AI developers
+
+#### Scenario: AGNTCY alignment explained
+- **WHEN** a new engineer reads 01-overview.md
+- **THEN** they SHALL understand what AGNTCY is, why SentryAgent.ai aligns to it, and what "first-class agent identity" means
+
+#### Scenario: Product features listed
+- **WHEN** a new engineer reads 01-overview.md
+- **THEN** they SHALL see a summary of all product capabilities: agent registry, OAuth 2.0 auth, credential management, audit logs, SDKs, web dashboard, policy engine, and monitoring
+
+#### Scenario: Phase roadmap visible
+- **WHEN** a new engineer reads 01-overview.md
+- **THEN** they SHALL understand which capabilities belong to Phase 1, Phase 2, and Phase 3
+
+#### Scenario: Engineering team structure explained
+- **WHEN** a new engineer reads 01-overview.md
+- **THEN** they SHALL understand the Virtual Engineering Team model (CTO → Architect → Developer → QA) and how Claude operates as the engineering partner
+
+#### Scenario: Free tier limits documented
+- **WHEN** a new engineer reads 01-overview.md
+- **THEN** they SHALL see the free tier limits (100 agents, 10,000 token requests/month, 90-day audit retention, 100 req/min) and understand the product's positioning