docs: add ecc2 alpha readme

ecc2/README.md

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+# ECC 2.0 Alpha
+
+`ecc2/` is the current Rust-based ECC 2.0 control-plane scaffold.
+
+It is usable as an alpha for local experimentation, but it is **not** the finished ECC 2.0 product yet.
+
+## What Exists Today
+
+- terminal UI dashboard
+- session store backed by SQLite
+- session start / stop / resume flows
+- background daemon mode
+- observability and risk-scoring primitives
+- worktree-aware session scaffolding
+- basic multi-session state and output tracking
+
+## What This Is For
+
+ECC 2.0 is the layer above individual harness installs.
+
+The goal is:
+
+- manage many agent sessions from one surface
+- keep session state, output, and risk visible
+- add orchestration, worktree management, and review controls
+- support Claude Code first without blocking future harness interoperability
+
+## Current Status
+
+This directory should be treated as:
+
+- real code
+- alpha quality
+- valid to build and test locally
+- not yet a public GA release
+
+Open issue clusters for the broader roadmap live in the main repo issue tracker under the `ecc-2.0` label.
+
+## Run It
+
+From the repo root:
+
+```bash
+cd ecc2
+cargo run
+```
+
+Useful commands:
+
+```bash
+# Launch the dashboard
+cargo run -- dashboard
+
+# Start a new session
+cargo run -- start --task "audit the repo and propose fixes" --agent claude --worktree
+
+# List sessions
+cargo run -- sessions
+
+# Inspect a session
+cargo run -- status latest
+
+# Stop a session
+cargo run -- stop <session-id>
+
+# Resume a failed/stopped session
+cargo run -- resume <session-id>
+
+# Run the daemon loop
+cargo run -- daemon
+```
+
+## Validate
+
+```bash
+cd ecc2
+cargo test
+```
+
+## What Is Still Missing
+
+The alpha is missing the higher-level operator surface that defines ECC 2.0:
+
+- richer multi-agent orchestration
+- explicit agent-to-agent delegation and summaries
+- visual worktree / diff review surface
+- stronger external harness compatibility
+- deeper memory and roadmap-aware planning layers
+- release packaging and installer story
+
+## Repo Rule
+
+Do not market `ecc2/` as done just because the scaffold builds.
+
+The right framing is:
+
+- ECC 2.0 alpha exists
+- it is usable for internal/operator testing
+- it is not the complete release yet