feat: Web UI for browsing, searching, and deleting memories

[pepinogttv]

Problem

There is no web-based way to explore, search, and delete memories. The TUI (engram tui) exists but requires a terminal and isn't accessible for all users. A browser-based UI would complement the TUI and lower the barrier to inspecting memory state.

Proposed Approach

A static SPA embedded in the Go binary via go:embed, served from engram serve at /ui/. Zero external dependencies at runtime.

Stack

• Vanilla JS — no framework, no build step, no node_modules
• Tailwind CSS via CDN — with the Engram Elephant color palette from styles.go
• Hash-based routing — #/memories, #/memories/:id, #/search, etc.

What it does (MVP scope)

• Dashboard — stats cards (sessions, observations, prompts, projects)
• Memory list — browse recent observations with type badges, project, date
• Memory detail — full content view with metadata
• Search — FTS5 full-text search with debounce, type/project filters
• Session list + detail — browse sessions and their observations
• Timeline — visual before/focus/after view
• Delete — soft-delete with confirmation modal (hard-delete option)
• Toast notifications — success/error feedback

What it does NOT include

• Editing or creating memories (agents create, UI reads)
• Authentication (same localhost-only model as current server)
• Build step or JS framework
• WebSocket / live updates

Backend changes (minimal)

• New internal/server/embed.go with //go:embed webui/*
• One new route in server.go: GET /ui/ serving the embedded SPA
• Zero new API endpoints — the existing HTTP API covers everything
• Optional engram ui CLI command to open the browser

Design

• Matches the Engram Elephant palette from internal/tui/styles.go (dark theme: #191724 base, #c4a7e7 lavender accent, #9ccfd8 green, #f6c177 peach, etc.)
• Responsive layout (sidebar on desktop, hamburger on mobile)
• Same screens as the TUI: Dashboard, Memories, Search, Sessions, Timeline

Risks / Tradeoffs

Risk	Mitigation
Tailwind CDN needs internet on first load	Fallback CSS with basic layout + colors in styles.css
Binary size increase	~50-80KB — negligible
Maintenance of vanilla JS long-term	Perfect for MVP; can migrate to framework if it grows

Affected Areas

• internal/server/ — embed + route
• internal/server/webui/ — new directory (HTML, JS, CSS)
• cmd/engram/main.go — optional engram ui command
• README.md, DOCS.md — documentation

[Alan-TheGentleman]

Terminal-only philosophy — the TUI covers browsing, searching, and viewing memories. No web UI planned. Thanks!