docs(adr): ADR-001 says what is true about the domains

[ExtraToast]

Closes #1273.

Three statements in docs/adr/frontend/ADR-001-domain-feature-architecture.md were false on main, and they are the kind that cost work: a reader planning against them would set out to build things that already exist.

What was wrong

The ADR said	What is true on main
"no domain has one" / "No domain exposes an index.ts"	All eleven do — association, auth, boards, cohorts, committees, contribution, emails, esports, jobs, recovery, user
"the cross-domain rule has never had an implementation to route through"	Both rules have been enforced since #1183 and #1206
"Report-only first, then error"	They landed at error and have never been report-only
"An eslint no-restricted-paths rule"	no-restricted-paths needs eslint-plugin-import, which is not a dependency. Both halves are one built-in no-restricted-imports entry

What it says now

The Enforcement section describes the rule that exists: one no-restricted-imports entry, two patterns, error. It records why it is one entry — a second block naming the same rule replaces the first rather than adding to it, which is how the first draft let a client import through — because that is the trap the next person editing this will walk into.

The allowlist is described as what it is: the debt count, 70 when the rule landed, 42 today (7 pages, 35 components), deleted when it empties. Measured on ec0e11212, and git grep -l "@/services/api" returns exactly those 7 and 35, so the list and the tree agree.

The .vue exception is written down as a decision rather than left to read as an oversight — a component is imported where it is drawn, and routing components through a barrel loads a domain's whole surface into anything that renders one.

The one remaining gap is stated rather than implied: the deep-import rule is scoped to pages/** and components/**, so a domain reaching into another domain is not yet checked. That is #1263.

One thing deliberately not settled here

The ADR also said domain names are singular — "board, not boards". Five are plural: boards, cohorts, committees, emails, jobs. Nothing enforces either way.

Renaming five directories moves every import that names them and would conflict with every open branch, so it is not a docs-only change and does not belong in this PR. The sentence now records that the rule was specified and never held to, and points at #1314, which settles it. A reader is told to follow the directory that is there rather than the sentence.

Acceptance criteria

• The claim that no domain exposes an index.ts is replaced by what the eleven domains actually expose
• The rollout wording says the rule is enforced as error, with the .vue exemption stated as a decision rather than as a gap
• No sentence in the ADR contradicts services/frontend/eslint.config.mjs at this commit
• Nothing outside the ADR changes — the diff is one file

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Diff breakdown — █ added ░ removed, scaled to the largest row.

docs                                               +34    -15    1
  docs               ██████████████████░░░░░░░░    +34    -15    1

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total (hand-written)                               +34    -15  1 file