Lift "groups must pre-exist" for the tree apply: a `[group]` node now carries a
declared parent (inferred from directory nesting) and `pic apply --dir` creates
the ones the server lacks, in the same transaction.
Wire: `TreeNode` gains `parent`/`name`/`description` (`#[serde(default)]` — a
pre-§6 CLI still reconciles existing groups). `discover::build_tree` computes a
group's parent as the nearest ancestor directory holding a `[group]` (topmost →
the repo's `[project] parent_group` attach point, else instance root) and emits
nodes parents-first by directory depth.
Server: `apply_tree` runs a Phase 0 (`create_missing_groups_tx`) that
resolves-or-creates every group node IN the tx (a same-tree parent resolved
before its child via the new `group_repo::{create_group_tx,
read_group_id_by_slug_tx}`), under the coarse `GROUP_STRUCTURAL_LOCK_KEY` (taken
only when creating), enforcing the attach-point ceiling + RBAC
(`InstanceCreateGroup` / `GroupAdmin(parent)`) per create. A created group is
CLAIMED in Phase A alongside existing ones (`decide_group_claim` → `Claim`).
`prepare_tree` now takes a caller-supplied `resolved_ids` map and returns a
`to_create` list the plan path previews (empty current → full-create plan,
ownership `claim`); a to-create group's token part equals its post-create part
so plan/apply tokens match across a create. `validate_bundle_for` takes
`is_group: bool` (a to-create group has no id yet); `authz_tree` skips a
to-create group (its create authz is the service gate, not an existing-group
capability).
Reparent of a diverged existing group + the detect-and-refuse flags are M2.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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