docs: add runnable quickstart example

examples/runnable-quickstart.md

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+# Runnable Quickstart
+
+A step-by-step walkthrough of an ArcheFlow run from scratch.
+
+## 1. Create a temp project
+
+```bash
+mkdir /tmp/af-demo && cd /tmp/af-demo
+git init && echo "# Demo" > README.md && git add . && git commit -m "init"
+```
+
+## 2. Initialize ArcheFlow
+
+```
+/af-init quick-fix
+```
+
+This creates `.archeflow/config.yaml` with sensible defaults (fast workflow, budget $5).
+
+Expected output:
+```
+archeflow v0.6.0 initialized (quick-fix bundle)
+  config: .archeflow/config.yaml
+  workflow: fast (Creator -> Maker -> Guardian)
+```
+
+## 3. Run a task
+
+```
+/af-run "Create a fibonacci function with edge case tests" --workflow fast
+```
+
+## 4. Expected output at each phase
+
+### Plan phase (Creator only -- Explorer skipped)
+
+The fast workflow skips Explorer because the task is small and specific.
+Creator produces a proposal:
+
+```
+-- archeflow -- Create fibonacci function -- fast --
+  Creator: fibonacci(n) with memoization, handles n<0 and n>46 overflow
+```
+
+Behind the scenes, Creator wrote a proposal with:
+- Architecture decision: iterative approach with memoization
+- File list: `fibonacci.py`, `test_fibonacci.py`
+- Confidence: task understanding 0.9, solution completeness 0.9, risk coverage 0.8
+
+### Do phase (Maker)
+
+Maker implements in an isolated worktree:
+
+```
+  Maker: 2 files, 4 tests, all passing
+```
+
+Maker followed the proposal: wrote tests first (negative input, zero, small values, large values), then implemented.
+
+### Check phase (Guardian)
+
+Guardian reviews the diff:
+
+```
+  Guardian: APPROVED (1 INFO -- consider adding type hints)
+```
+
+### Act phase
+
+All reviewers approved. Merge to main:
+
+```
+-- done -- 1 cycle . 3 agents . ~4 min --
+   fibonacci.py + test_fibonacci.py merged
+```
+
+## 5. Expected file tree
+
+```
+/tmp/af-demo/
+  README.md
+  fibonacci.py          # iterative fibonacci with memoization
+  test_fibonacci.py     # 4 test cases (negative, zero, small, overflow)
+  .archeflow/
+    config.yaml         # ArcheFlow configuration
+    runs/
+      run-001.jsonl     # event log for this run
+    progress.md         # final progress snapshot
+```
+
+## 6. What just happened
+
+Each phase maps to an archetype with a specific role:
+
+| Phase | Archetype | What it did |
+|-------|-----------|-------------|
+| Plan  | Creator   | Designed the solution: iterative fibonacci, memoization, test cases. Skipped Explorer (task is specific, files are known). |
+| Do    | Maker     | Implemented in isolated worktree. Tests first, then code. Committed after each step. |
+| Check | Guardian  | Reviewed the diff for security, correctness, and quality. Found no blockers. |
+| Act   | Orchestrator | All approved -- merged Maker's worktree branch into main. |
+
+The fast workflow used 3 agents in 1 cycle. A `standard` workflow would add Explorer (research) + Skeptic (assumptions) + Sage (quality). A `thorough` workflow adds Trickster (adversarial testing) on top.
+
+## Next steps
+
+- Try `--workflow standard` for a more thorough run
+- Try `/af-status` to see run details after completion
+- Try `/af-dag` to see the process DAG
+- Try `/af-report` for a full markdown report