# Sprint 141 Plan: Hybrid Authoring Foundations (Text-First + AST-First)

## Context

AST-first remains deterministic, but many users need immediate productivity in
classical languages (especially C++). Sprint 141 introduces explicit hybrid
authoring modes so teams can ship today while preserving AST-backed guarantees.

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## Goals

1. Add explicit authoring modes (`text_first`, `ast_first`, `hybrid`)
2. Make C++ text-first the production-ready default option
3. Persist mode/state in workspace/session config
4. Keep deterministic AST projection available in all modes

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## Steps

### Step 1649: Authoring mode schema and state model (10 tests)
### Step 1650: Workspace mode policy bindings (10 tests)
### Step 1651: Session-level mode override model (10 tests)
### Step 1652: C++ text-first default profile model (10 tests)
### Step 1653: `whetstone_get_authoring_mode` MCP tool (8 tests)
### Step 1654: `whetstone_set_authoring_mode` MCP tool (8 tests)
### Step 1655: `whetstone_get_mode_capabilities` MCP tool (8 tests)
### Step 1656: Mode transition event packet model (8 tests)
### Step 1657: Hybrid mode readiness report artifact (8 tests)
### Step 1658: Sprint 141 integration summary + regression (8 tests)

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## Architecture Gate

- Mode changes must be deterministic and auditable
- C++ text-first profile must be stable and defaultable per workspace
- Capability reports must be machine-readable
- Max 600 lines per header