tasks, harness: task verbs across the tree (#1556)

Row 63, round 2. Task verbs act in any installed project of the tree;
a project the tree doesn't hold refuses task-project as before, and a
watch-only one refuses with the new code. The harness task_create tool
takes an optional integer project. Round 2 adds Dewey's five proof
tests and Filbert's N1 child-path tests; the code is round 1's.

Candidate manifest 2a22fd3f (agents/darkwing/work/queue-63/r2/), base
cca5f23e, no drift on the six paths. Builder Darkwing. Approved by
Dewey (comment 28024) and Filbert (comment 28026). Sage's gate on
1117d19b plus the patch 2026-10-12T23:07:33Z-23:09:22Z: tasks 84,
harness 65, every scripts/test-*.sh green.

Lands before row 90 (decision 125). The harness change is live at the
next role session launch (decision 109); Mos had the notice.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/harness/src/tools.mjs

@@ -38,6 +38,7 @@ const PRIORITY = { type: "integer", minimum: 0, maximum: 5, description: "Priori
 const TASK_TOOLS = {
   "task.create": ["task_create", "Create a tracker task. Every task cites the request it came from and a requirement id.", {
     title: str("Task title, one line"),
+    project: { type: "integer", minimum: 1, description: "Tracker project id, an installed project in the business's tree; the root project when left out" },
     description: str("Task description"),
     due_date: DUE,
     priority: PRIORITY,