D48 — Provisioning extended to kind: agent/hook; hooks without auto-merge into settings.json; per-kind counts

Decision. Extends internal/provisioning (already kind-generic on Manifest/Lock/Diff, D27/D34/ D40) to two new kinds. kb.Init creates agents//hooks/ (optional/backward-compat); BuildManifest scans agents/<nome>.md (one file = one agent artifact) and hooks/<nome>/ (one directory = one hook artifact). destDir(kind, name, provider) generalizes skillDestDir: for agent/hook only claude has a known destination (.claude/agents/<nome>.md single file, .claude/hooks/<nome>/ directory) — other providers remain needs_approval. Hooks with no automatic merge into settings.json: that file is user-owned with nested arrays and no safe merge/prune — Cartographer materializes only the folder and prints a manual instruction (superseded by D57: registration is now automatic). New KindCounts aggregates installed/total per kind, shown by status/TUI. Rationale. The model was already kind-generic by design (D27/D34): the extension only required new emitters and a destination branch. The non-merge of hooks follows the same least-surprise philosophy as prune (D40): a user file with nested structure is not a safe target for silent automatic writes. The single file for agents mirrors the native format of a Claude subagent, instead of forcing them into the skills' directory convention. Details: docs/sync.md §Agents and hooks, docs/interoperability.md §Provider capability matrix.