H-6657: Improve inventory carry cost attribution

[CiaranMn]

🌟 What is the purpose of this PR?

Some improvements to how inventory carry cost is calculated and attributed, mainly to account for intermediates which are (a) shared across multiple finished goods, and (b) are shipped as finished goods in their own right – to ensure that we neither double count nor fail to incorporate dwell cost for these.

Also deletes older dummy data versions.

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

🕸️ Does this require a change to the Turbo Graph?

The changes in this PR:

• do not affect the execution graph

⚠️ Known issues

🐾 Next steps

🛡 What tests cover this?

❓ How to test this?

1. Checkout the branch / view the deployment
2. Try X
3. Confirm that Y

📹 Demo

[vercel]

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Project	Deployment	Actions	Updated (UTC)
hash	Ready	Preview, Comment	Jul 4, 2026 1:40pm

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
hashdotdesign-tokens	Ignored	Preview	Jul 4, 2026 1:40pm
petrinaut	Skipped		Jul 4, 2026 1:40pm

[cursor]

PR Summary

Low Risk
Demo seed cleanup only; risk is limited to environments or tests that still import the removed 2026-06-17.1 global supplier artifacts.

Overview
Removes the supplier-lines.json and supplier_performance.json seed payloads from supply-chain-demo/2026-06-17.1/_global/, dropping ~3.7k lines of precomputed PO-line and vendor OTIF rollup data for that older demo dataset version.

This aligns with pruning stale supply-chain dummy versions; the analysis gateway still serves _global/supplier-lines.json and supplier_performance.json from the current dataset (e.g. 2026-06-17.3), so runtime behavior depends on whether anything still pins 2026-06-17.1 as the active version.

The PR title/description also covers inventory carry-cost attribution changes in the frontend; those are not present in the diff snippet reviewed here.

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