[Reader] Expose Article Language in CLI - RW-45999

[rasulkireev]

Summary

The CLI can now pass Reader article language through document creation and bulk metadata edits, matching the Rekindled support shipped in readwiseio/rekindled#10398.

This refreshes cached tool schemas, adds a small Reader-specific schema shim while production listTools catches up, and surfaces the server's maxLength metadata in generated command help. The README examples now show language on create and bulk-edit paths.

Validation

• npm test
• npm run build
• node dist/index.js reader-create-document --help shows --language with max length: 30
• raw production listTools smoke: create-document and bulk-edit do not yet advertise language, so the local schema shim is still needed
• git diff --check

Post-Deploy Monitoring & Validation

• Validation window: first publish after merge, owner: release owner.
• Healthy signal: readwise reader-create-document --help includes --language, and readwise reader-bulk-edit-document-metadata accepts documents containing language.
• Watch for npm publish/build failures in the Publish npm package workflow and user reports of unknown --language options after upgrading.
• Rollback trigger: if the Reader language schema shim causes command registration or tool-call argument regressions, revert this PR and publish a patch release.

Related

Related to RW-45999.

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[linear-code]

RW-45999