feat(testdata): promote shakedown scenarios into testdata/shakedown/

testdata/shakedown/README.md

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+Shakedown flows — 2026-09-10 v2 launch prep
+
+These are the six canonical scenarios the launch-prep shakedown ran against
+`flows run`, extracted from `evidence/shakedown-0910/flow-sources.md` on branch
+`shakedown/v2-launch-0910`. Their run transcripts live under
+`evidence/shakedown-0910/*.txt` on that branch (drafted at PR #281).
+
+Scenario map:
+
+- `hello-world.flow.yaml` — pure deterministic; no external deps. Baseline
+  that the CLI's happy path works.
+- `agent-inline.flow.yaml` — inline `agents: { drafter: { cli, model } }`.
+  Verifies #263: named-agent inline models work without a `flows.json` in
+  the current or any ancestor directory.
+- `deep-cwd.flow.yaml` — a deterministic flow to run from a working
+  directory deep enough to push the daemon socket past macOS's SUN_LEN.
+  Verifies #262: the hashed-under-tmp derivation.
+- `chained.flow.yaml` — the flagship `llm → agent → deterministic` shape,
+  with typed JSON output. **Currently blocked**: no local `llm` worker
+  path (#273) and no declarative upstream-output binding (#275).
+- `error-path.flow.yaml` — deliberately misspells a CLI to exercise the
+  refusal shape. Sibling `error-dependency.flow.yaml` names a nonexistent
+  `dependsOn` step.
+- `observer.flow.yaml` — a small run intended to be paired with a live
+  `RELAYCAST_WORKSPACE_KEY` so `flows run` mints an observer URL and prints
+  it on stdout. Verifies #269 / #286.
+
+Supplemental variants (agent-codex, chained-codex, chained-llm.flow.ts,
+binding, etc.) remain snapshotted at
+`evidence/shakedown-0910/flow-sources.md` on the shakedown branch rather
+than promoted into this directory: they are exploratory shape-tests, not
+canonical scenarios. Promote one if it becomes a first-class example.

testdata/shakedown/agent-inline.flow.yaml

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+version: "0.1.0"
+name: agent-inline
+agents:
+  drafter:
+    cli: claude
+    model: claude-sonnet-4-6
+steps:
+  - id: draft
+    type: agent
+    agent: drafter
+    instruction: Reply with exactly hello. Do not use tools or modify files.
+    verification:
+      type: output_contains
+      value: hello

testdata/shakedown/chained.flow.yaml

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+version: "0.1.0"
+name: chained
+agents:
+  drafter:
+    cli: claude
+    model: claude-sonnet-4-6
+steps:
+  - id: extract
+    type: llm
+    cli: claude
+    model: claude-sonnet-4-6
+    prompt: 'Return only JSON: {"message":"hello"}'
+    output:
+      type: object
+      required: [message]
+      properties:
+        message: {type: string}
+      additionalProperties: false
+  - id: draft
+    type: agent
+    agent: drafter
+    dependsOn: [extract]
+    instruction: 'Repeat the message from this JSON as plain text: {{steps.extract.output}}. Do not use tools or modify files.'
+    verification:
+      type: output_contains
+      value: hello
+  - id: write
+    type: deterministic
+    dependsOn: [draft]
+    command: "printf '%s' '{{steps.draft.output}}' > shakedown-result.txt"

testdata/shakedown/deep-cwd.flow.yaml

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+version: "0.1.0"
+name: deep-cwd
+steps:
+  - id: hello
+    type: deterministic
+    command: printf hello

testdata/shakedown/error-dependency.flow.yaml

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+version: "0.1.0"
+name: error-dependency
+steps:
+  - id: broken
+    type: deterministic
+    dependsOn: [does-not-exist]
+    command: printf hello

testdata/shakedown/error-path.flow.yaml

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+version: "0.1.0"
+name: error-path
+steps:
+  - id: broken
+    type: agent
+    cli: claudee
+    instruction: Reply hello.
+    verification:
+      type: output_contains
+      value: hello

testdata/shakedown/hello-world.flow.yaml

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+version: "0.1.0"
+name: hello-world
+steps:
+  - id: hello
+    type: deterministic
+    command: printf hello

testdata/shakedown/observer.flow.yaml

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+version: "0.1.0"
+name: observer
+steps:
+  - id: hello
+    type: deterministic
+    command: printf hello