test: require queued jog observation and verify controller reset position

[ianbruene]

Motivation

• Stabilize the two newest Linux-only mockgrbl_e2e integration tests by making their assertions stronger and observable rather than timing-dependent.
• Ensure the queued absolute-jog sequencing test actually observes queued commands while motion is active instead of only checking final positions.
• Ensure the reset-during-jog test verifies DDGo observed the mock's materialized post-reset X position, not just that the mock ended up idle.

Description

• Modified internal/integration/mockgrbl/mockgrbl_e2e_test.go to use a longer queued jog target and feed (queuedJogTarget = -3.0, queuedJogFeed = 120.0) so queueing is observable in CI.
• Added an explicit observation step that waits for a mock state with `State ==

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Codex Task