chore(release): bump instructions to 0.4.20

[andrei-hasna]

Summary

• Bump @hasna/instructions from 0.4.19 to 0.4.20.
• Release-only metadata change after merged PR fix(profiles): remove retired project channel prefix #59.

Validation

• Base: 361c3e94b746609cc9d7ff0fc86bed77c1b1d2ea
• bun install --frozen-lockfile --minimum-release-age 604800 — pass
• env -u HASNA_INSTRUCTIONS_API_URL -u HASNA_INSTRUCTIONS_API_KEY -u HASNA_INSTRUCTIONS_DATABASE_URL -u INSTRUCTIONS_API_URL -u INSTRUCTIONS_API_KEY -u DATABASE_URL -u HASNA_INSTRUCTIONS_STORAGE_MODE bun test — 604 pass, 0 fail
• bun run typecheck — pass
• bun run prepublishOnly — pass (publish hold check and build)
• bun run src/cli/index.tsx package-manager-scan --fail-on-findings . — clean
• staged pre-commit secrets scan — clean, zero findings
• npm pack --dry-run — pass
• @hasna/instructions@0.4.20 is not yet present on npm

The broader check:package-secrets script was not used as the release gate because it includes pre-existing machine-home findings outside this repository; the package-only scan passed.

Do not merge or publish from this PR.

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