emrg: persist task execution records to JSONL + fix task-row flex-wrap

[argszero]

Fixes two host rants from 2026-08-19 (GUI task management):

1. rant 2026-08-19T20:49:52 (subtable position bug): the task-row CSS lacked flex-wrap — with the accordion subtable's flex-basis: 100% the detail row got squeezed to the right of the card instead of wrapping below. Fix: add flex-wrap: wrap to .task-row + a smoke assertion guarding both the wrap and the 100% basis.

2. rant 2026-08-19T20:50:36 (host Plan B — execution-record persistence): execution records lived only in the in-memory self.evolutions list (lost on daemon restart). Plan B: append each completed cycle as one JSON line to ~/.emrg/logs/task-runs/<task>.jsonl (TaskHandler._append_task_run at the cycle end), restore the last 50 on init (_load_task_runs), bounded append (trim to 50), fully fault-tolerant (corrupt line skipped / unreadable file → empty, write failure → warning only, cycle unaffected). In-memory list stays the primary source for status()/recent_runs; JSONL is the durable copy.

Tests: +4 scheduler unit tests (restart restore, 50-cap, corrupt-file tolerance, write-failure tolerance); +1 smoke assertion (flex-wrap). Full suite 986 passed + 1 skipped (987 collected); GUI smoke 131 pass; doc-count guard green (Agent.md 983→987 Python, 259→260 GUI).

[argszero]

✅ LGTM — cycle

Verified: full suite 986 passed + 1 skipped (987 collected); import + CLI checks green; doc-count guard green (Agent.md 983→987 Python, 259→260 GUI); GUI smoke 131 pass. CI test + test-windows both PASS (32256088924). Persistence is fault-tolerant (corrupt line skipped, write failure → warning only) and the in-memory list stays the primary status() source.

[argszero]

✅ LGTM — cycle

Fresh re-review (head 601bd14 unchanged): persistence is fault-tolerant per host Plan B (corrupt line skipped individually, unreadable file → empty list, write failure → warning only, cycle unaffected); bounded append trims to 50; status()/recent_runs still read the in-memory list. CSS fix is the minimal flex-wrap addition with a guarding assertion. CI test + test-windows PASS.

[argszero]

✅ LGTM — cycle

Third consecutive LGTM (head 601bd14 unchanged, CI test + test-windows PASS). Merging.