Context budget: large workspace metadata snapshot injected per session

[JustAGhosT]

Problem

Each session starts with a full workspace snapshot including:

• Git status, recent commits, branch info
• Full repo metadata (file counts, structure)
• Conversation summary from prior sessions
• Memory index contents

For large monorepos like mystira-workspace (.NET + TS + Rust, 76+ projects), this snapshot is expensive.

Proposed Solutions

1. Scoped metadata — retort should support a .retort/context-scope.yaml that defines which parts of the repo are relevant to the current work stream. A backend developer doesn't need frontend file counts.
2. Compressed repo summary — instead of raw git status + file listings, generate a semantic summary ("3 modified files in apps/app, on branch dev, last commit: feat X").
3. Session hooks for context pruning — retort's SessionStart hook could strip irrelevant metadata before it enters the context window.

[blocksorg]

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