Michael Suchacz 5565fcd03b docs: add frontend pattern rule contract (FE1-FE10) (#27407)
## What

Adds `.claude/docs/FRONTEND_PATTERNS.md`, a canonical frontend rule
contract for `site/src/` with ten stable rule IDs (FE1 to FE10), each
with short incorrect/correct examples using real repo idioms. Adds a
compact non-negotiables index at the top of `site/AGENTS.md` and links
the contract from the root `AGENTS.md` frontend routing line.

## Why

Frontend PRs keep drawing the same review findings. Mining the last 18
months of `site/` PR review data (330 closed/merged PRs, 1,105 inline
comments, 358 actionable pattern findings across 57 PRs) shows the
recurring themes, in order of frequency: missing Storybook interaction
coverage, loose TypeScript, component duplication and PR scope,
redundant comments, unhandled UI states, accessibility, react-query
misuse, and effect misuse. The guidance largely existed in
`site/AGENTS.md` already, but as unprioritized prose with no shared
vocabulary.

Stable rule IDs give reviewers, agents, and tooling one shared language
("FE7: re-typed query key"), and the rules are ordered by how often
reviewers actually flagged them.

This is the first PR of a stack of two:

1. This PR: the rule contract.
2. A `frontend-review` skill that audits diffs against these rules
pre-PR (#27408).

A third PR with a deterministic ratchet script (#27409) was closed; the
machine-checkable subset will be enforced through proper linting
instead.

## Notes for reviewers

The rule content is derived from your own review comments (for example,
the re-typed query key example in FE7 mirrors feedback on #27385). If a
rule does not match how you want the frontend built, the contract file
is the place to change it.

> This PR was written by Mux, an AI coding agent, on behalf of Mike.
2026-07-23 07:21:27 +02:00
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2026-06-16 14:43:54 -06:00
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2026-07-15 14:57:23 +01:00
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