v0.20.2

Fixed

• Studio, weft export --wefttest (P020.2): save as test on a run that offered no tools writes a test that compiles — it declared a tool-result handler it never used (declared and not used: answer); now it declares and imports only what the test uses.
• Studio (P020.2): the runs list fits its frame at 1280 to 1800 px — a run that delegated shows its subagents' tokens on a second line under its own instead of beside them, a token pair breaks only at its dot ("20 in ·" over "10 out", never "10" apart from "out"), the agent column holds a longer name ("procurement-desk", it read "procurement…"), the run column is 14 rem wide, 16 rem from 1360 px and 20 rem from 1680 px (14 rem again from 1536 px, where the session and model columns join), and the refresh button stays at the end of the first row instead of wrapping onto a row of its own.
• Studio (P020.2): a derived run's fix says what to set without a repository path ("(docs/record-contract.md §9)" is gone), and its waterfall starts under the view's controls — the layout toggle ends that row instead of standing alone above the waterfall.
• Studio (P020.2): the run page's waterfall keeps a duration on one line ("21.3 ms", it wrapped "21.3" over "ms"), shows a span's whole name when its row has room ("execute_tool lookup_order"), and an attempt's name beside its error chip ("attempt 1 · script" with stream_idle, it read "attempt 1 · s…").
• Studio (P020.2): the sessions list breaks "awaiting a decision · 1 call" and "1 exchange · 2 turns" only at their dot, and its find box shows "find title, prompt, id" whole; the Agents page's numbers end every bar at one place, whatever the width of its figure.
• devtools panel (P020.2): the header shows each of its figures — the tokens, the cost, the unpriced count — whole or not at all, never cut mid-figure ("≥1.0M in …", "2… $.."), the title keeping its room (a page of runs' title keeps the space before its count, "170907 · 928 runs"); the narrow dock's run picker puts the status, steps and duration before the title or a replay's lineage, so a cut title no longer takes them ("· 3 st"); a running turn's duration reads "…" instead of "—"; a parked call's arguments read on one line, as in the step's call list, instead of a pretty-printed block hanging off the tool's name; the decision field's placeholder is "result or deny reason", shown whole (0.20.1 said "result to resolve with" was shown whole; the placeholder was longer and cut).