feat: add opencode support for skills and MCP configuration

[Nikolasgs]

Summary

Adds opencode as a fifth supported agent alongside Claude Code, GitHub Copilot, Cursor, and Codex. opencode has no plugin marketplace for skill bundles (its own plugin concept is for npm-based JS/TS hooks), but it natively auto-discovers skills placed under .claude/skills/<name>/SKILL.md. This PR wires up that discovery path plus MCP registration for opencode's own config format.

Changes

• scripts/auth.py: add opencode to the _ALLOWED_AGENTS allowlist used for plugin attribution on outbound Dataverse requests.
• scripts/install-opencode.py (new): idempotent installer that copies the skills/dv-* folders and scripts/auth.py into an opencode-discoverable .claude/skills/ location (project or --global), since there is no marketplace install path for opencode.
• dv-connect/SKILL.md: route MCP_CLIENT_ID detection to mcp-configuration.md (removing a stale inline Claude/Copilot-only list that had already drifted from Cursor/Codex support), extend MCP skip-conditions and the agent enum to include opencode, and correct the "Supported Agents" section to name all five agents. Net effect: the skill body token count actually drops (~4996 -> ~4551 of the 5,000-token cap) despite the added coverage.
• mcp-configuration.md: add a full opencode branch across steps 0 (tool/client-ID detection), 1 (config scope: project opencode.json vs global ~/.config/opencode/opencode.json), 2 (existing-server check), 5 (registration via the same stdio npx proxy pattern already used for Cursor/Codex), 8 (confirmation + restart messaging), and 9 (troubleshooting).
• README.md / CONTRIBUTING.md: document the opencode install path and local testing workflow.
• Version bump 1.6.0 -> 1.7.0 (MINOR) across the 5 manifest files / 6 version fields per CLAUDE.md's semver rules (new agent capability, not a new skill directory).

Why

opencode is gaining adoption and already ships built-in Claude Code compatibility (.claude/skills, CLAUDE.md fallback, OPENCODE_DISABLE_CLAUDE_CODE_SKILLS env var), but this plugin had no install path or MCP wiring for it. Since opencode has no skill-bundle marketplace, the install story is a documented script rather than a one-line marketplace command — this PR makes that limitation explicit and gives users a supported path anyway.

Testing

• Verified frontmatter/body token counts for dv-connect/SKILL.md with the same cl100k_base encoder static_checks.py uses (body: 4,551 / 5,000 cap).
• Verified version consistency across all 6 manifest fields (all read 1.7.0).
• Verified _ALLOWED_SKILLS / _ALLOWED_AGENTS sync against actual skill directories.
• The python .github/evals/static_checks.py script was successfully run in this environment, and the checks passed. The reproduced checks above cover all categories relevant to this change. Additionally, CI's Static skill checks / Validate PR title and body workflows will run the authoritative versions.

[Nikolasgs]

@microsoft-github-policy-service agree

[Nikolasgs]

@microsoft-github-policy-service agree

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