WIP: stage all uncommitted work — sprints 46-221, graduation headers, specialist fleet, test steps 909-1988

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sprint126_plan.md

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+# Sprint 126 Plan: Campaign Checkpointing, Resume, and Export
+
+## Context
+
+Sprint 125 added deterministic multi-target debug campaigns and safety envelopes.
+Sprint 126 adds checkpoint capture, deterministic resume planning, and export bundles
+so agents can pause/recover work and produce machine-readable artifacts.
+
+---
+
+## Goals
+
+1. Add campaign checkpoint models and deterministic storage
+2. Add deterministic queue/resume planning utilities
+3. Add MCP tools for checkpoint save/list/resume and export
+4. Preserve deterministic ordering and replayability
+
+---
+
+## Steps
+
+### Step 1499: Campaign checkpoint model (10 tests)
+### Step 1500: Campaign checkpoint store (10 tests)
+### Step 1501: Campaign queue policy model (10 tests)
+### Step 1502: Campaign resume planner model (8 tests)
+### Step 1503: `whetstone_save_campaign_checkpoint` MCP tool (8 tests)
+### Step 1504: `whetstone_list_campaign_checkpoints` MCP tool (8 tests)
+### Step 1505: `whetstone_resume_debug_campaign` MCP tool (8 tests)
+### Step 1506: Campaign export bundle model (8 tests)
+### Step 1507: `whetstone_export_debug_campaign_bundle` MCP tool (8 tests)
+### Step 1508: Sprint 126 integration summary + regression (8 tests)
+
+---
+
+## Architecture Gate
+
+- Checkpoint ordering must be deterministic and stable
+- Resume must use latest checkpoint by deterministic rule
+- Export bundles must be machine-readable and replay-friendly
+- Max 600 lines per header