fix(api): accept bounded long tool descriptions

[seonghobae]

Summary

• remove the unsupported 1,024-character cap on tool.function.description
• retain the 64 KiB request-body bound and all tool name, type, parameters, strictness, and unknown-field validation
• accept an OpenCode-shaped 4,096-character description over the HTTP boundary

Runtime evidence

PR #876's exact-head hourly run installed and launched OpenCode successfully, then the gateway rejected OpenCode's built-in tool schema with invalid_tools because a description exceeded 1,024 characters. This fixes that shared gateway boundary rather than changing the installer.

Validation

• focused request/body/provider contract set: 41 passed
• all test_*tool*.py suites: 293 passed
• git diff --check: clean

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[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 5a01759 and 5e07bc6.

📒 Files selected for processing (3)

• CHANGELOG.md
• contextual_orchestrator/server.py
• tests/test_tool_description_length_http_honesty.py

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[seonghobae]

Exact-head local verification for 5e07bc6: uv run --with pytest pytest -q tests/test_tool_description_length_http_honesty.py completed with 2 passed. Hosted Actions and independent protected-branch review remain required; this is supporting evidence only.