Direct dispatch v2 — new-worktree + new-agent + Solo-project creation

## Goal The v2 of direct dispatch (#36): add the **creation flows** deferred from v1 — dispatch a brief to a NEWLY-created agent and/or a NEWLY-created worktree, from the brief detail. ## Depends on #103 (v1 verification) — blocked until v1 is proven working Rides on #22's `SpawnDaemonBridge` (spawn a new agent of a chosen harness) + worktree-manager. ## Scope 1. **New agent.** From "Dispatch direct", an option to spawn a NEW agent of a chosen harness (Claude/Codex/etc.) in an existing worktree and task it with the brief (reuses #22 SpawnDaemonBridge / solo-cli spawn). 2. **New worktree → Solo project → agent.** Create a NEW worktree from a chosen base branch, give it its own Solo project, spawn an agent in it, and task it — the full "worktree → solo project → spawn agent → task it" flow from the original #36 note. Operator chooses the base branch. 3. **Worktree grouping in the picker.** The selector shows worktrees + their agents (extends v1's grouped view) so it's clear which worktree a brief is dispatched to. 4. Same provenance as v1: record a `dispatch_request`, notify an active orchestrator via inbox. ## Acceptance - Operator can dispatch a brief to a new agent and/or a new worktree (with its own Solo project) from the brief page, choosing harness + base branch. - Tests with a faked spawn/worktree seam (no live spawn in CI). `php artisan test` green + pint. `Brief: #104` trailer. ## Provenance Chained v2 of #36 (operator, 2026-07-01), gated behind the #103 v1-verification. Rides on #22 (SpawnDaemonBridge) + worktree-manager. Created + chained by flower-refine (2026-07-03).

Chained follow-up to #36 (direct-dispatch v1), blocked on the v1-verification brief. Adds the creation flows deferred from v1: create a NEW agent of a chosen harness (reuses #22 SpawnDaemonBridge); create a NEW worktree from a chosen base branch → Solo project → spawn agent → task it (worktree-manager integration). Per operator's #36 answer (2026-07-01). Full spec via brief_update_spec.