Make MCP resources canonical and retire toolsets

[morluto]

Resolves #194.
Resolves #195.
Resolves #196.
Resolves #197.

Summary

GitContribute now exposes one stable MCP catalog and relies on host-native discovery instead of setup-time toolset selection. Durable dossiers, investigations, opportunities, evidence, and readiness reports use MCP resources as their canonical detailed representation; producer tools return compact typed references and native resource links.

The change removes the legacy --toolsets path, the retired [output] config shim, the top-level sync guidance shim, and overlapping scalar artifact getters. It also replaces historical v1-v4 evaluation fixtures with the current v5 unified-catalog condition while retaining deterministic in-memory MCP contract tests.

Compatibility

This deliberately removes compatibility surfaces instead of preserving another migration layer:

• MCP clients must support protocol-level resources/read; Codex exposes it as read_mcp_resource.
• The complete catalog is visible by default, including annotated local-write and process-execution tools. Deployments that require a read-only capability boundary should continue using --read-only.
• Existing config files containing the retired [output] section now fail strict decoding and must remove that section.
• --toolsets is no longer accepted. Host-native tool search or lazy loading owns catalog context management.

Validation

• make verify — passed: uncached short tests, golangci-lint, module tidiness, generated-output verification, and documentation validation.
• Codex resource-follow evaluation — 3/3 runs followed compact durable references through the exact MCP resource URI.

Review order

1. internal/mcpserver/resource_links.go, v1.go, and server.go for the canonical resource boundary.
2. internal/mcpserver/catalog.go, internal/mcpadapter/runner.go, and CLI/config changes for unified discovery and compatibility removal.
3. internal/mcpserver/server_contract_test.go for resource-link and catalog assertions.
4. internal/mcpserver/testdata/agent-eval/v5 and agent_eval_test.go for evaluation cleanup.

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