fix(asset_scaling): match base asset exactly, not as a string prefix

[gfyrag]

Summary

Tightens getAssets (in internal/interpreter/asset_scaling.go) so an entry
belongs to the baseAsset scaling pool iff its key is exactly
baseAsset or has the form baseAsset/N. Drops the spurious matches
the parent test PR pins.

This PR is stacked on #141 (the failing regression test). Merging
this flips TestGetAssetsRejectsSpuriousPrefixMatches from red to
green.

Stack

PR	What it does	Target
#141	Failing regression test pinning the bug	main
this PR (#140)	Tightens getAssets exact-match	#141 branch

Diff vs the parent test branch

Single 5-line change in getAssets:

- if strings.HasPrefix(asset, baseAsset) {
-     _, scale := getAssetScale(asset)
-     result[scale] = amount
- }
+ if asset != baseAsset && !strings.HasPrefix(asset, baseAsset+"/") {
+     continue
+ }
+ _, scale := getAssetScale(asset)
+ result[scale] = amount

Plus a doc-comment on the function.

Test plan

• TestGetAssetsRejectsSpuriousPrefixMatches passes (red on test(asset_scaling): pin getAssets prefix-match bug (failing) #141, green here).
• All other tests stay green.

🤖 Generated with Claude Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (test/asset-scaling-prefix-match-bug@7b65e3f). Learn more about missing BASE report.

Additional details and impacted files

@@                          Coverage Diff                           @@
##             test/asset-scaling-prefix-match-bug     #140   +/-   ##
======================================================================
  Coverage                                       ?   66.95%           
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  Files                                          ?       47           
  Lines                                          ?     5069           
  Branches                                       ?        0           
======================================================================
  Hits                                           ?     3394           
  Misses                                         ?     1477           
  Partials                                       ?      198           

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