merge: AgentProject membership — the junction is now load-bearing

Merges feat/agent-project-membership (task 166/152). An agent can finally join
many projects: membership routes, per-membership role and optional brain
override, chat resolving context from the membership, and CLI attach-agent /
detach-agent / get memberships. The legacy Agent.projectId fallback is kept for
this release as the schema comment promises.

Conflict resolved in main.ts: that branch added its RBAC case to
mapUrlToPermission inline, while this branch had extracted the function to
middleware/url-permission.ts so it could be tested. Kept the extraction and
ported the case into it — joining a team is `edit:agents:<name>`, not
`create:agents`, which is the authority to mint a whole agent.

Also fixes something the extraction makes possible. security.test.ts contained a
hand-copied reproduction of mapUrlToPermission, because main.ts self-invokes
main() and nothing in it was importable. A security test asserting against a
copy stops testing the system the moment the real one changes, and this copy had
already drifted. It now imports the real function; all 18 assertions still pass,
against the code that actually runs.

Local: build clean, workspace 2550 passed, lint unchanged at 794 errors.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4wNHWf7xSwnZCWpJcyv9p

.taskmaster/tasks/task_118.md

@@ -0,0 +1,25 @@
+# Task ID: 118
+
+**Title:** Add Task, TaskVerdict, TaskEvent Prisma models
+
+**Status:** pending
+
+**Dependencies:** 117
+
+**Priority:** high
+
+**Description:** Add Task, TaskVerdict, TaskEvent models with enums TaskState and TaskRisk to schema.prisma for work item tracking
+
+**Details:**
+
+In src/db/prisma/schema.prisma add:
+1. enum TaskState { todo, in_progress, building, self_testing, qa_review, security_review, sre_review, done, awaiting_review, merged, reopened, cancelled }
+2. enum TaskRisk { trivial, normal, high }
+3. model Task with: id, name, title, description (@db.Text), epicTaskId, repoId?, assigneeId?, state, risk, branch?, headCommit?, prUrl?, prNumber?, reviewNote? (@db.Text), ownerId, version, createdAt, updatedAt. Relations: epicTask, repo (CodeRepo?), assignee (Agent?), owner, verdicts[], sessions[], events[]. @@unique([name, epicTaskId]), indexes on epicTaskId, state, assigneeId
+4. model TaskVerdict with: id, taskId, stage (TaskState), agentId?, commit, passed, summary (@db.Text), findings (Json), createdAt. Relations: task, agent. @@index([taskId]), @@index([taskId, stage])
+5. model TaskEvent with: id, taskId, fromState?, toState, actorType, actorId?, note? (@db.Text), createdAt. @@index([taskId, createdAt])
+6. Add reverse relations to Agent model (assignedTasks[], verdicts[])
+
+**Test Strategy:**
+
+Schema tests: create Task linked to EpicTask, verify cascade on EpicTask delete, test TaskVerdict immutability pattern, test TaskEvent append-only by creating multiple events for same task.