chore: update omp to v18.6.1

[github-actions]

Updates all @oh-my-pi/* runtime packages to ~18.6.1.

Upstream release: v18.6.1

When merged, this PR will release omp-web@0.4.5 with a note for oh-my-pi v18.6.1.

⚠️ bun run typecheck or bun test failed against omp 18.6.1, so this PR is a draft: the release needs source changes in omp-web before it can merge. The failing output is in the workflow run.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​oh-my-pi/​pi-coding-agent@​18.1.17 ⏵ 18.6.1	+2
	npm/​@​oh-my-pi/​pi-utils@​18.1.17 ⏵ 18.6.1	+1
	npm/​@​oh-my-pi/​pi-agent-core@​18.1.17 ⏵ 18.6.1	+1
	npm/​@​oh-my-pi/​pi-ai@​18.1.17 ⏵ 18.6.1	+1
	npm/​@​oh-my-pi/​pi-tui@​18.1.17 ⏵ 18.6.1

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