feat(local-agent-v2): step 4 — journey produces structured AgentConfig JSON

Replace freeform prompt_template output with validated AgentConfig JSON:
- agent_setup.py: new system prompt (journey_system_v2), AGENT_CONFIG_START/END
  markers, _extract_agent_config() with Pydantic validation, updated handlers
  returning agent_config key; import AgentConfig from schemas
- tests/test_journey_v2.py: 6 unit tests + 5 parametrized LLM eval cases
  following test_agent_runner_v2.py pattern; _run_journey uses
  set_client_executor/clear_client_executor mirroring device_ws
- tests/fixtures/journey_v2/: cases.yaml + email_action.html + email_info.html
- tests/conftest.py: add --journey-dir CLI option; remove S3/plugin fixtures
  (cleanup from microservices migration, already present in working tree)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/fixtures/journey_v2/cases.yaml

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+# Journey V2 eval test cases — Step 4
+#
+# Each case simulates a complete journey session:
+#   1. handle_journey_start is called with directory + data_types
+#   2. handle_journey_message is called for each entry in user_messages
+#   3. Assertions are evaluated on the final reply
+#
+# directory_files: list of {path, content_file} — content_file is relative to data/
+#
+# Assertion keys:
+#   expect_question: true          → first reply must contain "?"
+#   expect_done: true              → final reply must have done=True
+#   expect_valid_config: true      → agent_config must be parseable as AgentConfig with content_types > 0
+#   expect_content_type_id: <str>  → AgentConfig.content_types must contain an entry with this id
+#   expect_extraction_contains: <str> → first content_type extraction_prompt must contain this word
+#   expect_global_rules: true      → AgentConfig.global_rules must be non-empty
+
+- id: "4.1"
+  description: "Journey start explores directory, first reply contains a question"
+  directory: "/test/emails"
+  data_types: ["tasks", "notes", "timelines"]
+  directory_files:
+    - path: "/test/emails/outlook_export_2024.html"
+      content_file: "email_action.html"
+  user_messages: []
+  score_name: "journey.start"
+  expect_question: true
+
+- id: "4.2"
+  description: "Full 3-turn conversation produces a valid AgentConfig JSON"
+  directory: "/test/emails"
+  data_types: ["tasks", "notes", "timelines"]
+  directory_files:
+    - path: "/test/emails/email_backup.html"
+      content_file: "email_action.html"
+  user_messages:
+    - "These are email exports from Outlook in HTML format"
+    - "Create tasks for emails with direct action requests, notes for informational emails"
+    - "Yes, that looks correct. No other rules."
+  score_name: "journey.valid_json"
+  expect_done: true
+  expect_valid_config: true
+
+- id: "4.3"
+  description: "Journey detects email_html content type from directory exploration"
+  directory: "/test/emails"
+  data_types: ["tasks", "notes"]
+  directory_files:
+    - path: "/test/emails/message.html"
+      content_file: "email_action.html"
+  user_messages:
+    - "HTML email backups from my mail client, exported from Outlook"
+    - "Create tasks from emails that contain assignments or direct action items"
+    - "Correct, no other rules needed"
+  score_name: "journey.detect_email"
+  expect_done: true
+  expect_content_type_id: "email_html"
+
+- id: "4.4"
+  description: "Custom user rule (only notes, no tasks) reflected in extraction_prompt"
+  directory: "/test/emails"
+  data_types: ["notes"]
+  directory_files:
+    - path: "/test/emails/email.html"
+      content_file: "email_info.html"
+  user_messages:
+    - "HTML emails from my work inbox"
+    - "Create only notes from all emails — I do not want tasks or timelines to be created"
+    - "Yes, exactly"
+  score_name: "journey.custom_rules"
+  expect_done: true
+  expect_extraction_contains: "note"
+
+- id: "4.5"
+  description: "Global rule (no project = no entity) appears in AgentConfig.global_rules"
+  directory: "/test/emails"
+  data_types: ["tasks", "notes"]
+  directory_files:
+    - path: "/test/emails/email.html"
+      content_file: "email_action.html"
+  user_messages:
+    - "Email backups from Outlook"
+    - "Create tasks from action request emails, notes from informational emails"
+    - "If the email cannot be matched to any project, do not create any entity at all"
+  score_name: "journey.global_rules"
+  expect_done: true
+  expect_global_rules: true

tests/fixtures/journey_v2/data/email_action.html

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+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>Email: Fix the login bug</title>
+  <style>body { font-family: Arial; } .header { color: #666; }</style>
+</head>
+<body>
+  <div class="header">
+    <p><strong>From:</strong> boss@company.com</p>
+    <p><strong>To:</strong> dev@company.com</p>
+    <p><strong>Subject:</strong> Fix the login bug</p>
+    <p><strong>Date:</strong> Mon, 7 Apr 2026 09:15:00 +0000</p>
+  </div>
+  <div class="body">
+    <p>Hi,</p>
+    <p>Please fix the login bug in Project Alpha as soon as possible.
+    Users are reporting that they can't log in with their Google accounts.
+    This is blocking the whole team. Please resolve it by Friday.</p>
+    <p>Thanks,<br>Boss</p>
+  </div>
+</body>
+</html>

tests/fixtures/journey_v2/data/email_info.html

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+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+  <title>Email: New policy update</title>
+  <style>body { font-family: Arial; }</style>
+</head>
+<body>
+  <div class="header">
+    <p><strong>From:</strong> hr@company.com</p>
+    <p><strong>To:</strong> all@company.com</p>
+    <p><strong>Subject:</strong> FYI: New remote work policy effective May 1</p>
+    <p><strong>Date:</strong> Tue, 8 Apr 2026 10:00:00 +0000</p>
+  </div>
+  <div class="body">
+    <p>Hi everyone,</p>
+    <p>Just a heads-up that starting May 1, 2026 the company will be moving to
+    a hybrid work model. You will be expected to come into the office at least
+    two days per week. More details will follow in the employee handbook.</p>
+    <p>Best,<br>HR Team</p>
+  </div>
+</body>
+</html>