feat: implement high-ROI milestone 3 administrative operations

[h3n4l]

Summary

• Implement 7 high-ROI MongoDB administrative methods prioritized by usage frequency
• Lower-ROI methods remain as planned operations with fallback to mongosh

Implemented Methods

Index Management:

• db.collection.createIndex(keys, options?) - Create a single index
• db.collection.dropIndex(index) - Drop index by name or key spec
• db.collection.dropIndexes() - Drop all indexes (except _id)

Collection Management:

• db.collection.drop() - Drop a collection
• db.collection.renameCollection(newName, dropTarget?) - Rename a collection

Database Management:

• db.createCollection(name) - Create a new collection
• db.dropDatabase() - Drop the current database

Not Implemented (Lower ROI)

These remain as planned operations with PlannedOperationError:

• createIndexes (batch index creation)
• stats(), serverStatus(), serverBuildInfo(), etc.
• Collection size methods (dataSize, storageSize, etc.)

Test plan

• All existing tests pass
• New integration tests for each implemented method
• Tests run on MongoDB 4.4, MongoDB 8.0, and DocumentDB
• renameCollection tests run only on MongoDB (not supported by DocumentDB)

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR implements the high-ROI subset of MongoDB administrative operations (indexes, collections, and database-level) in the translator and executor layers, with corresponding integration tests across MongoDB and DocumentDB. Lower-ROI admin methods remain planned-only with fallback via PlannedOperationError.

Changes:

• Extend the translator with new operation types (OpCreateIndex, OpDropIndex, OpDropIndexes, OpDrop, OpCreateCollection, OpDropDatabase, OpRenameCollection) and argument extraction for the corresponding shell methods and db statements.
• Add executor implementations for the new administrative operations, including index creation/deletion, collection creation/deletion/rename, and database drop, plus a MongoDB-only test runner helper.
• Update the method registry and error tests to reflect the reduced set of planned-only methods, and add comprehensive integration tests for all implemented admin operations.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
internal/translator/visitor.go	Routes new db statements and collection methods to the appropriate M3 administrative OpType values and extraction helpers.
internal/translator/types.go	Introduces new OperationType values and fields on Operation for index and collection admin metadata (keys, names, rename flags), plus a placeholder IndexModel type.
internal/translator/method_registry.go	Shrinks the planned-method registry to only lower-ROI administrative methods, removing entries for now-implemented admin operations.
internal/translator/database.go	Adds argument extraction for db.createCollection(...), validating and storing the target collection name.
internal/translator/collection.go	Implements argument extraction for createIndex, dropIndex, dropIndexes, and renameCollection, including validation and translation into Operation fields.
internal/testutil/container.go	Adds RunOnMongoDBOnly helper to run tests on MongoDB instances while skipping DocumentDB (needed for renameCollection).
internal/executor/executor.go	Wires new administrative OpTypes into the dispatcher and forwards them to dedicated admin executor functions.
internal/executor/admin.go	Implements execution of index, collection, and database admin commands against the Go MongoDB driver, including helper functions for index key comparison.
error_test.go	Adjusts planned-operation tests to use createIndexes instead of createIndex and updates method registry stats to the new planned-method count.
admin_test.go	Adds integration tests for create/drop indexes, create/drop collection, drop database, and rename collection (with and without dropTarget), including multi-backend coverage and MongoDB-only scenarios.

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 12 changed files in this pull request and generated 1 comment.

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