feat(hive-claude): parse turn telemetry in the lib, return it from run

hive-claude/README.md

@@ -22,7 +22,8 @@ Two layers — reach for the high-level one:
   `Result<Progress, Error>` does resume-or-create, compacts **reactively** on
   overflow (compact + retry once), and **proactively** after a clean turn when
   the policy says so (optional checkpoint turn, then compact). `.compact(…)`
-  forces one. `Progress { created, compacted }` reports what happened.
+  forces one. `Progress { created, compacted, telemetry }` reports what happened
+  — including the turn's parsed `Telemetry`, finalised at the `result` event.
 - **`Claude::run(&config, &attach, prompt, &sink)`** → `Result<(), Error>` —
   the low-level driver: one turn, one `Attach` target (`Resume` / `Create` /
   `Continue` / `OneOff`). A clean turn is `Ok(())`; every other state is an
@@ -38,8 +39,9 @@ Supporting pieces:
 - **`Sink`** — a trait with no-op defaults; implement what you care about to
   observe stream events, non-JSON stdout, and stderr. `NoopSink` ignores all.
 - **`SessionStore`** — locate and archive on-disk sessions by title.
-- **`Usage`** — the minimal context signal (`context_tokens`,
-  `context_window`) the policy sees.
+- **`Telemetry`** (`context`, `cost`, `context_window`, `model`) — everything
+  the driver parses from a turn's stream, returned in `Progress`. **`Usage`** is
+  the minimal slice (`context_tokens`, `context_window`) the policy sees.
 
 `Error` unifies the two things that can stop a turn: recognized **sentinels**
 (`PromptTooLong`, `RateLimited`, `AuthFailed`, `SessionNotFound`) and **hard