Phase 5 C4. `pic plan --dir <root>` / `pic apply --dir <root>` discover every
`picloud.toml` under a directory (groups + apps), assemble the wire tree
bundle, and drive the C3 `/tree/{plan,apply}` endpoints — a whole project
subtree reconciled and reviewed as one unit.
* New `discover` module: recursive walk (skips `.picloud`/`.git`/`scripts`/
`target`), one node per manifest, app/group inferred from the manifest;
rejects a duplicate (kind, slug). On-disk nesting is organizational — the
server resolves ancestry from its own group tree.
* `client`: `plan_tree`/`apply_tree` + `TreePlanDto`/`NodePlanDto`. `pic plan
--dir` renders a per-node diff table and records ONE tree bound-token under
a `<tree>` linkstate marker; `pic apply --dir` replays it (force/`--yes`/
prune apply tree-wide). `--dir` conflicts with `--file`.
Live-validated: a nested tree (root group dir + nested app dir, app route bound
to the group's inherited script) → `pic plan --dir .` shows both nodes' changes
→ `pic apply --dir .` applies all in one tx → re-plan all-noop.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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