Add chat-first workspace roadmap

Document the post-3.1 milestones needed to make the stable workspace product feel natural in chat-driven LLM interfaces.

Add a follow-on roadmap for model-native file ops, workspace naming and discovery, tool profiles, shell output cleanup, and use-case recipes with smoke coverage. Link it from the README, vision doc, and completed workspace GA roadmap so the next phase is explicit.

Keep the sequence anchored to the workspace-first vision and continue to treat disk tools as secondary rather than the main chat-facing surface.

docs/roadmap/llm-chat-ergonomics/3.6.0-use-case-recipes-and-smoke-packs.md

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+# `3.6.0` Use-Case Recipes And Smoke Packs
+
+Status: Planned
+
+## Goal
+
+Turn the five target workflows into first-class documented stories and runnable
+verification paths.
+
+## Public API Changes
+
+No new core API is required in this milestone.
+
+The main deliverable is packaging the now-mature workspace surface into clear
+recipes, examples, and smoke scenarios that prove the intended user experience.
+
+## Implementation Boundaries
+
+- build on the existing stable workspace contract and the earlier chat-first
+  milestones
+- keep the focus on user-facing flows, not internal test harness complexity
+- treat the recipes as product documentation, not private maintainer notes
+
+## Non-Goals
+
+- no new CI or scheduler abstractions
+- no speculative cloud orchestration work
+- no broad expansion of disk tooling as the main story
+
+## Acceptance Scenarios
+
+- cold-start repo validation has a documented and smoke-tested flow
+- repro-plus-fix loops have a documented and smoke-tested flow
+- parallel isolated workspaces have a documented and smoke-tested flow
+- unsafe or untrusted code inspection has a documented and smoke-tested flow
+- review and evaluation workflows have a documented and smoke-tested flow
+
+## Required Repo Updates
+
+- a dedicated doc or section for each target use case
+- at least one canonical example per use case in CLI, SDK, or MCP form
+- smoke scenarios that prove each flow on a real Firecracker-backed path