Move pending review comments to `glab mr note draft` subcommands
### Problem to solve
Pending review comments (draft notes) are currently exposed as a `--draft` flag on the existing `glab mr note` verbs, plus a separate `publish` verb:
| Action | Today | Status |
| --- | --- | --- |
| Create | `glab mr note create --draft` | Merged in !3885, released in v1.119.0 |
| Publish | `glab mr note publish` | Merged in !3909, released in v1.120.0 |
| List | `glab mr note list --draft` | Proposed in !3963 (#8563) |
| Discard | `glab mr note delete --draft <id>` | Proposed in !3963 (#8563) |
| Edit | `glab mr note update --draft <id>` | Proposed in #8569 |
Draft notes are a different GitLab resource with a different API (`/merge_requests/:iid/draft_notes`, `DraftNotesService` in client-go) than published notes and discussions. Overloading every `mr note` verb with `--draft` has these costs:
- Every verb branches on `--draft` into a separate code path, with its own client calls, output format, and error messages. `create` already has to dispatch `--draft` before `--reply`, and `list`/`delete`/`update` would each need a parallel implementation (!3963 adds `runDraft`, `completeDraft`, and a separate printer).
- Flag matrices grow. `--draft` must be rejected with `--unique`, `--resolvable=false`, and `--internal` on `create`, and with `--type` and `--state` on `list`. Each rule needs validation code, help text, and tests.
- The ID namespace changes under the same command: `glab mr note delete 123 456` deletes note 456, while `glab mr note delete --draft 123 456` deletes draft note 456.
- `--draft` already means "draft merge request" on `glab mr create`, `glab mr update`, and `glab mr list`. `glab mr list --draft` and `glab mr note list --draft` would filter completely different things.
- The publish step lives at `glab mr note publish`, detached from the commands that manage what it publishes.
Discussed in !3885 (https://gitlab.com/gitlab-org/cli/-/merge_requests/3885#note_3928426677) and agreed by @viktomas, @phikai, and @andrei.zubov. This is the shape used by the original POC (!2932) and by https://gitlab.com/viktomas/note.
### Proposal
Add a `draft` noun under `glab mr note` that owns the full pending review lifecycle, and remove the flag-based commands:
```shell
glab mr note draft create [<id> | <branch>] [-m <body>] [--file <path> [--line N[:M] | --old-line N]] [--reply <discussion-id>] [--attach <file>]
glab mr note draft list [<id> | <branch>] [--file <path>] [-F json]
glab mr note draft update [<id> | <branch>] <draft-note-id> [-m <body>] [--attach <file>]
glab mr note draft delete [<id> | <branch>] <draft-note-id> [--yes]
glab mr note draft publish [<id> | <branch>] [-m <summary>] [--internal] [--reviewer-state requested_changes|reviewed] [--yes]
```
Mapping from the current and proposed commands:
| Before | After |
| --- | --- |
| `glab mr note create --draft` | `glab mr note draft create` |
| `glab mr note publish` | `glab mr note draft publish` |
| `glab mr note list --draft` (!3963) | `glab mr note draft list` |
| `glab mr note delete --draft` (!3963) | `glab mr note draft delete` |
| `glab mr note update --draft` (#8569) | `glab mr note draft update` |
Behavior carried over unchanged:
- `draft create`: same diff targeting (`--file`, `--line`, `--old-line`), same `--reply` prefix resolution, same `--attach` behavior, and the success output stays the bare draft note ID so it can be piped into `draft update` and `draft delete`. Flags that never applied to drafts (`--unique`, `--resolvable`, `--internal`) do not exist on the new command, so their conflict rules and tests go away.
- `draft publish`: same flags, confirmation prompt, `--yes` requirement when non-interactive, and the "no pending review comments" error from `glab mr note publish`.
- `draft list` and `draft delete`: the output and prompt behavior designed in !3963.
- `draft update`: the position-preserving update described in #8569 (re-send the existing `position`, because the API clears it otherwise: https://gitlab.com/gitlab-org/gitlab/-/work_items/631434).
Removal of the old surface:
- Remove `--draft` from `glab mr note create` and remove `glab mr note publish`, with no deprecation period. Both are marked `(EXPERIMENTAL)`, and the help text states that experimental features "might be unstable or removed at any time." Call out the removal in the MR and release notes.
- Do not add `--draft` to `mr note list`, `mr note delete`, or `mr note update`.
### Further details
Implementation notes:
- Put the commands in their own package (for example `internal/commands/mr/note/draft/`), registered from `NewCmdNote` in `internal/commands/mr/note/mr_note.go` in place of `NewCmdPublish`.
- Move the `--file`/`--line`/`--old-line` → `gitlab.PositionOptions` resolution currently inline in `mr_note_create.go` `complete` into a helper shared by `mr note create` and `mr note draft create`. `mrutils.BuildDiffPosition` and `mrutils.ResolveDiscussionID` are already shared.
- Move `mr_note_publish.go`, its unit tests, and `Test_MrNotePublish_Integration` to the new package. The integration test currently creates its fixture with `NewCmdCreate` and `--draft`, so switch it to `draft create`.
- Run `make gen-docs`. It generates `docs/source/mr/note/draft/*.md`, prunes `docs/source/mr/note/publish.md`, updates `docs/navigation-glab.yaml`, and removes the `--draft` section from `docs/source/mr/note/create.md`.
- Keep `text.ExperimentalString` on every new command.
Effect on in-flight work:
- !3963 (@adityaswarupparida): retarget from `list --draft` / `delete --draft` to `draft list` / `draft delete`. The printing and prompt logic carries over. Only the command wiring and flag-conflict code changes.
- #8569: retarget to `draft update`.
Out of scope:
- Publishing a single draft note (`PUT /draft_notes/:id/publish`). `draft publish` keeps the bulk "submit review" semantics.
- Exposing the draft-notes `resolve_discussion` field ("resolve this thread when the review publishes").
Open question: should the noun be `draft`, matching the API and the original proposal, or `review`, matching the UI's "Start a review" and "Submit review"? This issue proposes `draft`.
### Links / references
- Design discussion: https://gitlab.com/gitlab-org/cli/-/merge_requests/3885#note_3928426677
- `create --draft`: !3885
- `publish`: !3909
- Pending review workflow tracking: #8560
- List and discard: #8563, !3963
- Edit: #8569
- Original POC: !2932, epic https://gitlab.com/groups/gitlab-org/-/work_items/21295
- Prior art: https://gitlab.com/viktomas/note
- Draft notes API: https://docs.gitlab.com/api/draft_notes/
issue
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