feat(planning): EYT-120 transport foundation - #103
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Reviewer's GuideThis precursor extends only the contracts package with a publicly exported Gregorian LocalDate primitive and a strict, minimal WorksiteDay DTO that separates stable identity from revision-bound configuration, intentionally adds no route, persistence, migration, UI, or working-time materialization. File-Level Changes
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Hey - I've found 1 issue
Prompt for AI Agents
Please address the comments from this code review:
## Individual Comments
### Comment 1
<location path="packages/contracts/src/primitives.ts" line_range="59" />
<code_context>
+ const match = /^(\d{4})-(\d{2})-(\d{2})$/.exec(value);
+ if (match === null) return false;
+
+ const year = Number(match[1]);
+ const month = Number(match[2]);
+ const day = Number(match[3]);
+ const leapYear = year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0);
+ const daysPerMonth = [31, leapYear ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
+
+ return month >= 1 && month <= 12 && day >= 1 && day <= (daysPerMonth[month - 1] ?? 0);
+ }, "Kein realer Kalendertag im gregorianischen Kalender")
+ .describe("Lokaler Kalendertag im Format 2026-09-07 — ohne Uhrzeit, ohne Zone");
</code_context>
<issue_to_address>
**issue (bug_risk):** `LocalDateSchema` accepts `0000-02-29` because the leap-year calculation treats year zero as divisible by 400, even though the domain's local-date conversion explicitly rejects years below 1 and the documented Gregorian calendar has no year zero.
**Triggers:** When a client sends a four-digit local date with year `0000`.
**Suggested fix:** Reject years below 1 before applying the leap-year calculation, for example with `if (year < 1) return false;`.
```suggestion
if (year < 1) return false;
const leapYear = year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0);
```
</issue_to_address>Sourcery assessment
Approval pending. 1 finding to address first.
Blocking findings: packages/contracts/src/primitives.ts:59
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EYT-120 technical precursor
This PR introduces only the transport/domain-contract foundation required by the later EYT-120 Engagement Contract.
The change is limited to
packages/contracts/**: deterministic LocalDate validation, a minimal stable WorksiteDay identity/revision DTO, public exports, and direct tests.Summary by Sourcery
Establish the transport and domain-contract foundation for worksite-day planning.
New Features:
Enhancements:
Tests: