README: tell consumers and their agents to read the guidelines

[Cuervino]

The guidelines are shipped in the npm package, under stories/, but nothing tells a consumer to read them. A mockup generated by an agent broke three rules that were already written (Toggle in a form with a Save button, delete modal without the resource name, "Done" on a read-only modal).

The README gets a Guidelines section: where the guideline files are in the package, what to read before using a component or building a screen, and a line to add to a project's CLAUDE.md or AGENTS.md, since agents only read the instruction file of the project they work in.

[bert-e]

Hello cuervino,

My role is to assist you with the merge of this
pull request. Please type @bert-e help to get information
on this process, or consult the user documentation.

Available options

name	description	privileged	authored
/after_pull_request	Wait for the given pull request id to be merged before continuing with the current one.
/bypass_author_approval	Bypass the pull request author's approval	⭐
/bypass_build_status	Bypass the build and test status	⭐
/bypass_commit_size	Bypass the check on the size of the changeset TBA	⭐
/bypass_incompatible_branch	Bypass the check on the source branch prefix	⭐
/bypass_jira_check	Bypass the Jira issue check	⭐
/bypass_peer_approval	Bypass the pull request peers' approval	⭐
/bypass_leader_approval	Bypass the pull request leaders' approval	⭐
/bypass_source_branch_lineage	Bypass the cross-branch contamination check	⭐
/approve	Instruct Bert-E that the author has approved the pull request.		✍️
/create_pull_requests	Allow the creation of integration pull requests.
/create_integration_branches	Allow the creation of integration branches.
/no_octopus	Prevent Wall-E from doing any octopus merge and use multiple consecutive merge instead
/unanimity	Change review acceptance criteria from one reviewer at least to all reviewers
/wait	Instruct Bert-E not to run until further notice.

Available commands

name	description	privileged
/help	Print Bert-E's manual in the pull request.
/status	Print Bert-E's current status in the pull request.
/clear	Remove all comments from Bert-E from the history TBA
/retry	Re-start a fresh build TBA
/build	Re-start a fresh build TBA
/force_reset	Delete integration branches & pull requests, and restart merge process from the beginning.
/reset	Try to remove integration branches unless there are commits on them which do not appear on the source branch.

Status report is not available.

[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• one peer

Peer approvals must include at least 1 approval from the following list:

• @ZiyangLinScality

• @ChengYanJin

• @JeanMarcMilletScality

• @hervedombya

• @damiengillesscality

• @sanassicisse

• @JBWatenbergScality

• @PierreAlexandreDelgado

[claude]

stories/guideline/docs-template.mdx is a blank authoring template ("Component name", "General description"), not a rule, and it ships too. An agent told to read every .mdx under stories/guideline/ will read it as guidance. Exclude it here and in the agent line below, or move it out of stories/guideline/.