Feature: Hierarchical Long-Term Memory for Squad Agents

Problem

Squad's memory has gaps that worsen as projects grow:

1. history.md is chronological, not structural — agents know what happened but not how the system works. Architecture knowledge is scattered across summarized sessions.
2. No hierarchical loading — all context loads at once. A small bug fix gets the same context payload as a major refactor.
3. Coordinator has no memory — re-discovers user preferences, workflows, and project layout every session.
4. No ownership boundaries — any agent can read/write any file, risking mental model corruption across domains.

Solution

A two-tier structured memory layer alongside existing files (history.md and decisions.md remain unchanged):

Index contains: quick reference, architecture overview, core interfaces, topic index, cross-cutting patterns, key decisions, user preferences.

Topic files contain deep knowledge per subsystem (e.g., memory-detection-engines.md, memory-keel.md, memory-kusto-queries.md).

Key Design Decisions

• Agent ownership — each agent reads/writes only its own memory. Coordinator never writes to agent memory directly; it spawns the owning agent instead.
• Coordinator memory — separate memory.md at .squad/ level for workflow patterns, user preferences, routing rules.
• Human override — "Remember that…" / "Forget that…" / "Load memory" commands route through ownership rules.
• Markdown over database — human-readable, git-versionable, works across all Copilot surfaces (CLI, VS Code, GitHub.com).
• Purely additive — no changes to history.md, decisions.md, Scribe, progressive summarization, or any existing behavior.

Changes Required

• Templates: new memory.md and coordinator-memory.md templates, ## Memory section in charter
• Init/spawn flows: create and load memory files
• Coordinator: handle remember/forget/load-memory intents, read/write own memory
• Scribe: read-only access to memory for state preservation
• Documentation updates

📎 Full RFC: long-term-memory-rfc.md | Integration guide: long-term-memory-install.md