[Repo Assist] refactor(guard): extract parseDIFCTagsFromAny helper in wasm_parse.go

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Closes #6514

Summary

Extracts a parseDIFCTagsFromAny helper to eliminate 4 duplicate tag-parsing blocks in internal/guard/wasm_parse.go, as identified in #6514.

Root Cause

Both parseResourceResponse and parseCollectionLabeledData contain identical secrecy and integrity tag-parsing logic (converting []any → []difc.Tag). This pattern appeared 4 times across ~48 lines.

Fix

Extract a single parseDIFCTagsFromAny(raw any) []difc.Tag helper and replace all 4 duplicate blocks with calls to it.

Trade-offs

• Pure refactor — no behaviour change
• Any future changes to tag-parsing logic (e.g., whitespace trimming, case normalisation) now have a single place to update

Test Status

⚠️ Infrastructure limitation: Network access to proxy.golang.org is blocked in this environment, preventing go build and go test from running. Syntax was verified with gofmt -e. The change is a mechanical substitution with no logic changes — the helper function contains exactly the code that was previously inlined 4 times.

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Pull request overview

This PR refactors DIFC tag parsing in the WASM guard response parsing code by extracting a shared helper, reducing duplication while preserving existing parsing semantics.

Changes:

• Added parseDIFCTagsFromAny(raw any) []difc.Tag to centralize conversion from []any to []difc.Tag.
• Replaced four duplicated secrecy/integrity parsing blocks in parseResourceResponse and parseCollectionLabeledData with calls to the helper.

Show a summary per file

File	Description
internal/guard/wasm_parse.go	Extracts a shared tag-parsing helper and reuses it in resource/collection response parsing to remove duplicated logic.

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• Files reviewed: 1/1 changed files
• Comments generated: 0