fix(frontend): select the session cwd mount by name, order mount listings deterministically

[mmabrouk]

What was broken

On staging, the Files drawer sometimes showed an empty tree with no session-files option even though the agent had written files into the session workspace (reported by Mahmoud during release QA, reproduced live).

Cause

The drawer picked the working-directory mount with mounts.find((m) => m.slug === "cwd"), but the wire slug has been the minted reserved slug (__ag__session__<uuid5>__cwd) since before that line was written, so the selector never matched once and every drawer ran on mounts[0]: an UNORDERED SQL result. When a sibling mount (pi-sessions) happened to come back first, the drawer pointed at the wrong mount: empty tree, and the All/Agent/Session control never rendered. Pre-existing since the drive surfaces landed (byte-identical in v0.106.2); plausibly surfaced now because the release's new query predicates can flip the arbitrary row order.

Fix

• New pickCwdMount helper in @agenta/entities/session: match by name === "cwd" first (the API returns it on every response), then a __cwd slug-suffix fallback, then the old first-mount fallback. Used at all three call sites so they cannot drift again.
• The mounts DAO applies a stable ORDER BY created_at, id when no windowing is passed, so no consumer depends on undefined row order.

Tests

Helper unit tests (name beats position, suffix fallback, empty list) and a DB-backed ordering test that stamps created_at out of insertion order and fails with the ORDER BY removed (verified by mutation).

https://claude.ai/code/session_01McMogkcDRV7UpSAjfd8VKG

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Updated at 2026-08-01T20:32:41.300Z