chore: add changeset for CLI UX overhaul

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: prosdev

.changeset/cli-ux-overhaul.md

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+---
+"@prosdevlab/dev-agent": minor
+---
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+### CLI UX Overhaul
+
+**Setup (`dev setup`)**
+- Native-first: Antfly native binary is now the default, Docker available via `--docker` flag
+- Consistent ora spinners throughout (no more mixed logger/spinner output)
+- Docker model pull: setup now pulls the embedding model inside Docker containers
+- Docker memory warning: warns if Docker has less than 4GB allocated
+
+**Index (`dev index`)**
+- 7x faster: removed `buildCodeMetadata` (32s of N+1 git calls → 0s)
+- Auto-starts Antfly if not running — no more "fetch failed" errors
+- Ora spinners with file count during scanning, elapsed timer during embedding
+- Pre-flight model check: auto-pulls embedding model if missing
+- Resilient error messages with actionable guidance (OOM, port conflict, model missing)
+- Normalized `dev index .` → `dev index` (path defaults to cwd)
+- Improved next steps: MCP install, try-it-out commands, `dev --help`
+- Removed dead "Git history" line from indexing plan
+
+**Reset (`dev reset`)**
+- New command to tear down Antfly and clean all indexed data
+- Supports both Docker and native cleanup
+- Directs users to `dev setup` to start fresh
+
+**MCP Server**
+- Auto-starts Antfly on MCP server startup (no manual `dev setup` needed after reboot)
+- Auto-recovery: if Antfly crashes mid-session, MCP retries tool calls after restarting the server
+- Human-readable errors when Antfly is unreachable
+
+**Antfly Resilience**
+- Native-first priority in `ensureAntfly` (better performance, no VM overhead)
+- Port conflict detection with `lsof` guidance
+- `linearMerge` now reports per-page progress via `onProgress` callback
+- Upgraded ora to 9.x