Add OCI IoT gateway-aware MCP support

[wsanders00]

Description

Adds gateway-aware OCI IoT MCP support for src/oci-iot-mcp-server.

Fixes #347

This change:

• Preserves and accepts gateway-aware digital twin instance fields, including connectivity_type and gateways.
• Adds agent-friendly topology and readiness helpers for gateway-aware twin workflows.
• Adds relationship pagination helpers plus SDK-parity filters/pagination arguments for IoT list tools.
• Preserves more SDK fields in digital twin model and relationship mapped outputs.
• Updates the OCI IoT MCP README and tests for the expanded tool surface.
• Refreshes the OCI IoT MCP dependency lockfile, including oci==2.180.0.

No new OCI IoT SDK service surface was found in oci==2.180.0; the SDK bump is dependency hygiene for this PR.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• uv run pytest oracle/oci_iot_mcp_server/tests
• PATH=.venv/bin:$PATH make test project=oci-iot-mcp-server
• make lint
• make lock-check project=oci-iot-mcp-server
• git diff --check
• uv lock --upgrade --dry-run
• uv tree --outdated --depth 1
• uv tool run pip-audit --path .venv/lib/python3.13/site-packages --progress-spinner off

Test result summary:

• uv run pytest oracle/oci_iot_mcp_server/tests: 275 passed
• make test project=oci-iot-mcp-server: 275 passed, package coverage 91.44%, combined coverage 91%
• make lint: passed
• make lock-check project=oci-iot-mcp-server: passed
• git diff --check: passed
• uv lock --upgrade --dry-run: no lockfile changes
• uv tree --outdated --depth 1: direct dependencies current
• pip-audit: reports only cryptography 46.0.7 / GHSA-537c-gmf6-5ccf, fixed in 48.0.1; current OCI SDK metadata constrains cryptography<47.0.0

Sergio tested and approved the gateway-aware MCP behavior on 2026-06-19. Since that approval, the current PR tip differs from the approved feature commit only in src/oci-iot-mcp-server/uv.lock dependency refreshes plus branch packaging.

Test Configuration:

• Firmware version: N/A
• Hardware: N/A
• Toolchain: Python 3.13.9, uv, pytest 9.1.1
• SDK: OCI Python SDK 2.180.0

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules