feat(mcp): enter_project becomes a small primer: goal, recent work, open work, vocabulary (#4045)

The handshake carried the whole project record, every milestone's plan, full
rule text, the notes most recently edited and ~9k of design guidance. For
project 2 that was ~222k characters, past what an MCP client accepts as a tool
result. Each category was walked through with the operator and sized to what a
session needs on arrival; each names the call that has the rest.

- project: id, title, status and the full goal (session start's "full goal"
  pointer still lands here). get_project keeps the whole record.
- milestone_summary: the 5 most recently touched milestones, any status, most
  recent first, without plans. Summaries gain last_touched_at: the later of
  the milestone's own edit and its newest step update, from the query that
  already counts steps. milestone_summary_omitted counts the rest and points
  to list_milestones. get_project and list_milestones list every milestone,
  also without plans.
- open_tasks: the 10 most recently touched open tasks, with or without a
  milestone, each naming its milestone. list_notes gains sort="touched"
  (the later of updated_at and the newest work-log), because a log doesn't
  bump updated_at.
- recent_notes: dropped. Retrieval surfaces notes by relevance, and
  get_recent covers recency.
- systems: id and name.
- design_system: summary plus guidance_call. get_design_system gains
  resolved_guidance, the chain-merged prose; its own guidance field is only
  the departures, so session start's old pointer to it led to a fragment.
  The session start pointer and using-scribe's "Building UI" section now
  name resolved_guidance.
- rules: rules_payload(brief=True) gives project_rules as id and title plus
  subscribed_rulebooks, and records only what it shows. Retrieval delivers
  rules in full and ignores subscriptions (#4052). Other callers unchanged.
- pattern_coverage, inception and systems_bootstrap: unchanged.

Clients: the plugin's using-scribe skill, the compaction notice and session
start are updated here; the REST project summary only gains last_touched_at.
Plugin version minted.

Tests: a size ceiling on the handshake for a large project; milestone and
task selection and naming; brief rules; resolved_guidance; the session
start pointer; and a real-Postgres test that a work-log touches its task and
a step update touches its milestone.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy

tests/test_mcp_tool_design_systems.py

@@ -197,3 +197,25 @@ async def test_update_token_leaves_supersedes_alone_when_omitted():
         from scribe.mcp.tools.design_systems import update_design_token
         await update_design_token(token_id=9, purpose="text on action surfaces")
     assert "supersedes" not in svc.update_token.await_args.kwargs
+
+
+# --- get: the guidance a UI session builds from -----------------------------
+
+@pytest.mark.asyncio
+async def test_get_design_system_carries_the_chain_merged_guidance():
+    """enter_project carries only a summary and points here (#4045). The
+    system's own `guidance` field is only its departures; a session building
+    UI needs the house style too, so the merged form rides alongside."""
+    from scribe.mcp.tools.design_systems import get_design_system
+
+    merged = [{"design_system_id": 1, "title": "House", "guidance": "house style"},
+              {"design_system_id": 2, "title": "App", "guidance": "departures"}]
+    with patch("scribe.mcp.tools.design_systems.ds_svc.get_design_system",
+               AsyncMock(return_value=_fake_design_system())), \
+         patch("scribe.mcp.tools.design_systems.ds_svc.list_tokens",
+               AsyncMock(return_value=[])), \
+         patch("scribe.mcp.tools.design_systems.ds_svc.design_context",
+               AsyncMock(return_value={"guidance": merged})):
+        out = await get_design_system(2)
+
+    assert out["resolved_guidance"] == merged