refactor(multicore): remove obsolete worker-task paths

[stritti]

Summary

Tightens the final ownership model from #170 and removes the abandoned parallel paths that would reintroduce cross-core access to mutable controller state.

Changes

• remove obsolete PublishTask.*
• remove obsolete DisplayTask.*
• align PoolController.cpp comments with the actual scheduler behavior
• explicitly document that NORVI UI rendering stays on Core 1
• explicitly document that telemetry is drained on the Core-1 loop task

Architectural intent

After this PR the multicore model has one worker responsibility only:

• Core 0: sensor/OneWire acquisition
• Core 1: mutable controller state, rules, relays, MQTT, Web, OTA and UI

This keeps #170 focused on the minimum concurrency boundary and avoids leaving dead alternative implementations in the tree.

Base

Stacked on feat/multicore-task-architecture / #170.

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ ACTION	actionlint	8		0		0	0.78s
✅ BASH	bash-exec	2		0		0	0.67s
✅ BASH	shellcheck	2		0		0	0.68s
✅ BASH	shfmt	2		0		0	0.01s
✅ C	clang-format	1		0		0	0.04s
✅ C	cppcheck	1		0		0	0.03s
✅ C	cpplint	1		0		0	0.32s
✅ CPP	clang-format	102		0		0	0.81s
✅ CPP	cppcheck	102		0		0	6.48s
✅ CPP	cpplint	102		0		0	7.91s
✅ EDITORCONFIG	editorconfig-checker	286		0		0	0.73s
✅ JSON	jsonlint	6		0		0	0.13s
✅ JSON	v8r	6		0		0	4.01s
⚠️ MARKDOWN	markdownlint	107		3		0	4.22s
✅ YAML	yamllint	25		0		0	0.84s

Detailed Issues

⚠️ MARKDOWN / markdownlint - 3 errors

.opencode/skills/web-ui/SKILL.md:34 error MD028/no-blanks-blockquote Blank line inside blockquote
docs/superpowers/plans/2026-08-10-olimex-c6-local-ui-implementation.md:106:401 error MD013/line-length Line length [Expected: 400; Actual: 452]
docs/superpowers/plans/2026-08-16-norvi-button-calibration.md:7:401 error MD013/line-length Line length [Expected: 400; Actual: 412]

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[github-actions]

Native Test Coverage

Metric	Value
Line Coverage	61.8%
Branch Coverage	71.8%
Lines Hit/Total	525/850
Branches Hit/Total	216/301

Report from native unit tests (ASan + gcov).

[stritti]

Der aktuelle Head von #170 enthält diese Bereinigung inzwischen selbst: PublishTask/DisplayTask und TaskStartupPolicy sind entfernt, CoreScheduler besitzt nur noch den SensorTask, Telemetrie und UI bleiben auf Core 1 und die Multicore-Dokumentation ist entsprechend aktualisiert. Damit ist #213 fachlich vollständig durch #170 superseded. Eine Synchronisierung würde dieselben Änderungen nur erneut gegen den bereits bereinigten Base-Branch anwenden und Konflikte erzeugen. Ich schließe #213 daher als redundant; die relevante Verifikation bleibt auf #170.