feat: add docfill mvp cli

docs/superpowers/plans/2026-06-18-docfill-p0.6-freeze.md

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+# Docfill P0.6 Freeze Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Freeze the current MVP as a small deliverable that can be built, smoke-tested, and handed to a digital employee.
+
+**Architecture:** Keep the current single-command CLI and add only delivery wrappers: a local build script, a runbook, and ignore rules for generated artifacts. No new runtime features.
+
+**Tech Stack:** Go, shell, existing `docfill run` CLI.
+
+---
+
+### Task 1: Build Output
+
+**Files:**
+- Modify: `.gitignore`
+- Create: `scripts/build.sh`
+
+- [ ] Ignore `dist/`.
+- [ ] Build only the current machine target into `dist/docfill-darwin-arm64`.
+- [ ] Print the output path.
+
+### Task 2: Digital Employee Runbook
+
+**Files:**
+- Create: `docs/digital-employee-runbook.md`
+- Modify: `README.md`
+
+- [ ] Document required inputs, command contract, stdout/stderr handling, exit codes, and common errors.
+- [ ] Link the runbook from README.
+
+### Task 3: Freeze Verification
+
+- [ ] Run `go test -count=1 ./...`.
+- [ ] Run `bash scripts/smoke.sh`.
+- [ ] Run `bash scripts/build.sh`.
+- [ ] Stage all project files except local ignored files.
+- [ ] Commit as `feat: add docfill mvp cli`.