fix: restore the /v1 prefix on the stream URL, dot glyph for a flat tool fold

[hbrooks]

Summary

• The WebSocket stream URL is the one route the CLI builds by hand; api: drop the /v1 prefix from every route #103 dropped its /v1 prefix on the belief the backend had, but v1_router.py still mounts at prefix="/v1" (/v1/me answers 401, /me answers 404). Restored.
• Corrected every apiRoutes help line and the two prose route mentions, which advertised prefix-free paths. Verified each against the router's real paths.
• A tool run that opens a turn branches off nothing, so its collapsed fold takes the assistant's dot instead of ⎿.

Test plan

• bun run typecheck
• bunx vitest run (427 passing)
• agent session start --watch against prod: the stream connects instead of 404ing

Important

Restores the /v1 prefix on the WebSocket stream URL and corrects all CLI route documentation to match the backend's actual paths.

• The stream URL in buildStreamUrl() now includes /v1 (/v1/sessions/{id}/stream instead of /sessions/{id}/stream), fixing the 404 that occurred when streaming sessions.
• All apiRoutes() documentation strings across 18 command files updated to show /v1/ prefix — these were advertising prefix-free paths but the backend router mounts at prefix="/v1", making them incorrect.
• Collapsed fold glyphs adjusted: tool runs that open a turn now show ● instead of ⎿, since they branch off nothing (only nested folds get the branch glyph).

^{This description was created by for 47bb670. It will automatically update as commits are pushed.}

[ellipsis-dev]

Important

Looks good to me! 👍

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