chore(deps): align TinyAgents with v2.1

[senamakel]

Summary

• require TinyAgents 2.1 instead of the legacy 1.x range
• refresh the TinyFlows lockfile
• prevent OpenHuman from resolving a second TinyAgents 1.9 crate after its vendored SDK moves to v2.1

Validation

• cargo check --locked

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📥 Commits

Reviewing files that changed from the base of the PR and between 56998ec and 23dd23a.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• Cargo.toml
• src/graph_ops.rs

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