Push completion legacy state if lift is already on the level

[aaronchongth]

Bug fix

Fixed bug

Fixes open-rmf/rmf_demos#346

If the RTF is fast enough, this is able to be resolved by the usual lift state subscription observer, but with a normal RTF it can get skipped as the lift states don't come in fast enough, therefore leaving the event on Standby. Which causes the below event states, note that the stale Standby event causes the upstream events to also be on Standby even though subsequent events have already been completed successfully

                     "11": {
                        "deps": [],
                        "detail": "",
                        "id": 11,
                        "name": "Requesting lift [Lift2] to [L1]",
                        "status": "standby"
                    },
                    "12": {
                        "deps": [],
                        "detail": "",
                        "id": 12,
                        "name": "Move to [graph-wp:17] < 16.9841 -24.2211  -1.5817> through 2 points",
                        "status": "completed"
                    },
                    "13": {
                        "deps": [],
                        "detail": "",
                        "id": 13,
                        "name": "Requesting lift [Lift2] to [L2]",
                        "status": "completed"
                    },
                    "14": {
                        "deps": [],
                        "detail": "",
                        "id": 14,
                        "name": "Move to [graph-wp:24] < 17.0699 -21.6342 -1.60394> through 2 points",
                        "status": "completed"
                    },
                    "15": {
                        "deps": [],
                        "detail": "",
                        "id": 15,
                        "name": "End session with lift [Lift2]",
                        "status": "completed"
                    },
                     ...,
                     "9": {
                        "deps": [
                            11,
                            12,
                            13,
                            14,
                            15
                        ],
                        "detail": "",
                        "id": 9,
                        "name": "Take [lift:Lift2] to [floor:L2]",
                        "status": "standby"
                    },
                   ....

Fix applied

Added the missing push of completion legacy status when the lift is already on the same level.

Screencast.From.2026-02-25.14-04-14.mp4

GenAI Use

We follow OSRA's policy on GenAI tools

• I used a GenAI tool in this PR.
• I did not use GenAI

Generated-by: