📝 Milestone: What was delivered in S270 Platform Elements Evolution?

Date: 2026-03-25
Time: 21:48:30 UTC
Session: gspace1-270.8
Agent: angular
Confidence: 95%
Status: ✅ Documented

📋 Decision Context

Question:

What was delivered in S270 Platform Elements Evolution?

Task: S270 Platform Elements Evolution

🎯 Decision Made

Chosen:

15 tasks completed across 5 milestones: (1) Mutation protocol with 6 typed ops, executor, source sync, receiver. (2) Two-bundle split: production 49.8KB / editor 51.1KB gzip. (3) Router MutationObserver for auto-discovery. (4) Expression AST caching + 150 tests + inline error display + undo/redo history. (5) Chat plugin with 4 slash commands + message enrichment. (6) Backend platform_elements_edit tool. (7) Studio integration: source doc storage, entity cache, PE context signal, mutation handler via Subject. (8) Suggestion engine with 17 tests. (9) 18 P1 elements (9 vanilla + 9 Lit) with styles, manifest entries, generation prompt. Total: 216 tests, 41 elements in manifest.

Options Considered:

1. Execute milestones across multiple sessions (slower but safer)
2. Execute all 5 in one session with parallel subagents (chosen — achieved full delivery)

💭 Reasoning

All 5 milestones from the evolution plan were addressed in a single session using subagent-driven development. Groups A-D parallelized effectively. Bundle size stayed under 50KB limit (49.8KB with 1.4KB margin). Remaining gaps: entity cache doesn't fetch (needs Studio HTTP context), suggestion engine has no UI, VFS persistence not wired with debounce, click-to-Vitto context signal needs Angular component wiring.

📁 Files Involved

• docs/superpowers/specs/2026-03-25-platform-elements-evolution-design.md
• docs/superpowers/plans/2026-03-25-platform-elements-evolution-impl-plan.md

🔗 Related

• Decision ID: dev_1774475309574_vj65zwk
• Session: 270
• Workspace: gspace1

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