feat: add Dataverse CLI as MCP fallback for simple CRUD and N:N

[arorashivam96]

Summary

• Adds the Dataverse CLI (npx @microsoft/dataverse) as a middle tier in the tool routing hierarchy: MCP → CLI → SDK → Web API
• When MCP is unavailable, basic users can perform simple CRUD with a single shell command instead of writing a Python script
• N:N record association/disassociation now uses CLI data associate/data disassociate instead of raw Web API $ref boilerplate
• Fixes pre-existing dv-overview token budget violation (5186 > 5000) by extracting tool-routing content to references/
• Version bump 1.5.0 → 1.6.0 (MINOR: new backward-compatible capability)

Files changed

• dv-overview/SKILL.md — Amend Hard Rule 1 (Python Only → CLI carve-out), Hard Rule 2 (new routing hierarchy), extract Tool Capabilities table to references
• dv-overview/references/tool-routing.md — New file: full tool capabilities table with CLI row, volume guidance, MCP availability check flow
• dv-data/SKILL.md — CLI Quick Reference section (create/get/update/delete/associate/disassociate), N:N moved from Web API to CLI, MCP fallback guidance
• dv-query/SKILL.md — CLI Query Fallback section (query/get/count), updated routing table with MCP-available vs MCP-unavailable columns
• Version manifests (3 files, 4 fields) — 1.5.0 → 1.6.0

Test plan

• python .github/evals/static_checks.py passes (8 skill files, 45 Python blocks, 8 categories)
• python .github/evals/version_bump_check.py passes (MINOR bump validated)
• Manual: CLI commands in skills match actual @microsoft/dataverse CLI surface
• Manual: Verify agent routes to CLI when MCP is unavailable for simple CRUD
• Manual: Verify agent routes to SDK for bulk operations (10+ records)

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