feat(marks)!: v0.2.0 — marks replaces asks, and the CLI surface moves with it

The release that closes U2. Consumers have to adapt, which is what makes this a
minor rather than a patch: three things a scripted session can notice.

  * `booth asks <name>` now emits JSON, not the old aligned human table.
    Anything parsing those columns breaks. `booth marks <name>` is the name to
    use; `asks` survives as a deprecated alias for the muscle memory.
  * Polling `http://…/b/<n>/<stem>.answer.json` will 404 forever. There is no
    per-question answer sidecar any more. `GET /b/<n>/marks.json` replaces it and
    answers for the whole booth in one request — including an `open` list.
  * `#ask-<stem>` page anchors are now `#mark-<id>`, and `/b/<n>/asks` 308s to
    `/b/<n>/marks`.

What a session GAINS: the operator can now attach a note to any item or to the
booth, and flag individual items — both readable with `booth marks`. Selecting
winners out of a set used to be a chat message.

Nothing a session already wrote is lost. Legacy `*.ask.json` / `*.answer.json`
sidecars are imported by `booth marks-import <name>`, idempotently, and are
never deleted.

No lockfile step: this repo tracks none (uv.lock is gitignored, 790d5ba).

ROADMAP.md

@@ -1,7 +1,7 @@
 # The Booth — roadmap
 
 Design: [`docs/design/information-architecture.md`](docs/design/information-architecture.md).
-Current version: `0.1.15` (the accreted service, extracted from eshpfi 2026-09-21).
+Current version: `0.2.0` (U1 + U2 landed; extracted from eshpfi 2026-09-21).
 
 ## v1 target
 
@@ -10,8 +10,8 @@ defect — not a wish. The measurements are in the IA doc.
 
 | # | capability | closes | unit |
 |---|---|---|---|
-| 1 | **One item record** — resolved once, carried to gallery, zoom, doc, zip | captions never reach the zoom view (never sent, not lost) | U1 |
-| 2 | **Marks** — `pick` / `note` / `flag`, one primitive, one read path | 5 mechanisms for 1 job; operator→session loop runs through chat | U2 |
+| 1 | ~~**One item record**~~ — **landed `ce598b3`** | captions never reach the zoom view (never sent, not lost) | U1 |
+| 2 | ~~**Marks**~~ — **landed `c7f9437`, released `v0.2.0`** | 5 mechanisms for 1 job; operator→session loop runs through chat | U2 |
 | 3 | **Declared embed seam** — `/_booth/embed.js`, chrome mounts via DOM | 6 regexes injected into arbitrary author HTML, load-bearing for asks | U3 |
 | 4 | **Derived lifetime** — open marks pin; viewing is activity | 54% of booths on the `.forever` escape hatch | U4 |
 | 5 | **Self-announcing booths** — `.booth.json`, provenance on the index | job 5 had no home, so it lived on the link board as 145 dead rows | U5 |
@@ -22,6 +22,9 @@ Ordering is dependency-driven, not priority-driven: **U1 → U2 → {U3, U4, U5}
 U7**, with **U6 independent** of all of them (different storage, different
 surface) and therefore the safest thing to land first or in parallel.
 
+**U1 and U2 are landed**, which unblocks U3, U4 and U5 — all three read marks.
+**U5 is next** (operator, 2026-09-21). U6 remains independent and unstarted.
+
 ### Cross-cutting invariant — deterministic order, everywhere
 
 **Every ordered collection the Booth renders must have a stated, deterministic