Remove npm global prefix workaround after use-m fix

[konard]

Summary

Fixes #1910.

• Removed Hive Mind's ensureWritableNpmGlobalPrefix bootstrap preflight and deleted src/npm-global-prefix.lib.mjs.
• Replaced workaround-specific tests with tests/test-use-m-bootstrap-no-npm-prefix-workaround.mjs, which guards against reintroducing project-local npm prefix policy.
• Updated the issue Fix install error #1897 case study and added a patch changeset for the cleanup.

Upstream Verification

• link-foundation/use-m#55 was merged on June 12, 2026 and closes link-foundation/use-m#54.
• use-m@8.13.8 is the latest npm release, published on June 12, 2026.
• I unpacked use-m@8.13.8 and verified use.js, use.mjs, and use.cjs include the upstream non-writable npm global-root fallback: they check npm root -g, preserve explicit npm_config_prefix / NPM_CONFIG_PREFIX with actionable errors, and otherwise redirect installs to a use-m-owned cache prefix under XDG_CACHE_HOME or ~/.cache/use-m/npm-global.

Reproduction

The new regression guard fails on the pre-fix code because src/npm-global-prefix.lib.mjs exists and src/use-m-bootstrap.lib.mjs imports/runs the local preflight:

• node tests/test-use-m-bootstrap-no-npm-prefix-workaround.mjs

Verification

• node tests/test-use-m-bootstrap-no-npm-prefix-workaround.mjs
• npm run lint
• npm run format:check
• npm test (all 248 selected default test files passed)
• git diff --check

[konard]

Working session summary

Implemented and pushed PR 1911: #1911

Removed Hive Mind’s local npm global-prefix workaround now that upstream use-m@8.13.8 handles non-writable global roots. The PR now deletes src/npm-global-prefix.lib.mjs, simplifies src/use-m-bootstrap.lib.mjs, replaces the workaround test with a guard against reintroducing local prefix policy, updates the issue #1897 case study, and adds a patch changeset.

Verification:

• Confirmed upstream link-foundation/use-m#55 merged and use-m@8.13.8 contains the fallback in use.js, use.mjs, and use.cjs.
• Local checks passed:
  • node tests/test-use-m-bootstrap-no-npm-prefix-workaround.mjs
  • npm run lint
  • npm run format:check
  • npm test with all 248 selected default tests passing
  • git diff --check
• PR CI passed for commit b3d6588a: https://github.com/link-assistant/hive-mind/actions/runs/27445117894

PR is marked ready for review, merge state is clean, and git status --short is clean.

---

This summary was automatically extracted from the AI working session output.

[konard]

🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: GPT-5.5
• Provider: OpenAI
• Public pricing estimate: $13.445166

📊 Context and tokens usage:

• 200.1K / 1.1M (19%) input tokens, 33.5K / 128K (26%) output tokens

Total: (200.1K + 9.9M cached) input tokens, 33.5K output tokens, $13.445166 cost

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.5
• Model: GPT-5.5 (gpt-5.5)

📎 Log file uploaded as Repository (43837KB)

• View complete solution draft log

---

Now working session is ended, feel free to review and add any feedback on the solution draft.

[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• All CI checks have passed
• No merge conflicts
• No pending changes

---

Monitored by hive-mind with --auto-restart-until-mergeable flag