Depend on reactor 1.0.4

[echarles]

Raises the floors on the reactor packages just released: npm @datalayer/reactor, reactor-commands, reactor-graph, reactor-manager, reactor-shell 1.0.4; PyPI datalayer-reactor, reactor-mcp-server 1.0.4. Version floors only; no code change.

[Copilot]

Copilot review overview

🟢 Approval recommended

All reviewed changes consistently raise dependency floors, with no unresolved issues.

Review effort: Lite
Findings: None

What changed in this PR

Raises minimum Reactor dependencies to version 1.0.4 across Python and npm packages.

Changes:

• Requires datalayer_reactor>=1.0.4.
• Raises JavaScript peer dependency floors to ^1.0.4.

File	Description
pyproject.toml	Raises the Python Reactor dependency floor.
plugins/​ai-agents/​package.json	Raises the AI agents plugin’s Reactor peer dependency.
package.json	Raises the root package’s Reactor peer dependency.

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