feat: add canonical station layouts

[duncanleo]

Summary

• add 546 canonical station exits across 160 stations
• add required lastUpdated provenance dates to station layout records
• add current platform labels, line/service mappings, and standardized MRT door counts
• cover all current MRT and LRT stations with 442 platform faces
• add 153 platform-pair transfer paths across every current interchange
• classify Bukit Panjang, Newton, and Tampines as out-of-station interchanges
• retain the station-layout plan while removing temporary research scripts and staging artifacts

Why

Station records previously lacked complete passenger-facing layout data. This fills the canonical target layout directly in data/station so downstream consumers can render exits, boarding platforms, service directions, door counts, and interchange connectivity without relying on temporary research artifacts.

Data boundaries

• MRT door counts use rolling-stock standards by line.
• LRT door counts remain absent because one- and two-car formations coexist.
• Transfer distances and traversal times remain null unless a defensible endpoint-to-endpoint measurement is available.
• Door-relative escalator and lift anchors remain empty where official/operator public data does not support a reliable network-wide mapping.
• Future station and future service changes are not modeled as current layout data.

Validation

• npm run data:validate
• npm run check
• npm test — 30 files and 314 tests passed
• coverage audit: no active station missing platforms, no empty platform service mappings, and no missing cross-line platform pair at current interchanges

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between ff1a07d and 8f339c4.

📒 Files selected for processing (191)

• .changeset/closed-exits-update.md
• data/station/ADM.json
• data/station/ALJ.json
• data/station/AMK.json
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• data/station/XPO.json
• data/station/YCK.json
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• docs/plans/active/station-layout-data.md
• packages/core/src/schema/Station.test.ts
• packages/core/src/schema/Station.ts
• packages/fs/src/index.test.ts
• packages/fs/src/validate.ts
• scripts/generate-fixtures.mjs

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