Rename transaction methods to Tx suffix

[0x80]

Rename InTransaction/FromTransaction naming to the Tx suffix convention used by @typed-firestore/server. The Tx suffix goes at the end, with Maybe before it (e.g. getDocumentMaybeTx).

Fixes two bugs:

• getDocumentTx and getDocumentMaybeTx were using makeMutableDocument instead of makeMutableDocumentTx, so mutations bypassed the transaction.
• getSpecificDocumentTx was returning an immutable FsDocument instead of a mutable FsMutableDocumentTx.

Deprecated re-exports are provided for all old names to maintain backward compatibility.

[Copilot]

Pull request overview

Updates the library’s public API naming to use a Tx suffix for transaction-aware helpers (matching the @typed-firestore/server convention) and fixes transaction mutation behavior to correctly bind updates/deletes to the provided Firestore transaction.

Changes:

• Renames transaction variants to *Tx (with Maybe before Tx) and adds deprecated aliases for prior names.
• Fixes transaction helpers to use makeMutableDocumentTx so mutations don’t bypass the transaction.
• Ensures getSpecificDocumentTx returns a mutable transaction document type and updates docs accordingly.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/types.ts	Introduces FsMutableDocumentTx and deprecates FsMutableDocumentInTransaction alias.
src/make-mutable-document.ts	Adds makeMutableDocumentTx, deprecates makeMutableDocumentInTransaction.
src/get-specific-document.ts	Renames transaction accessor to getSpecificDocumentTx and returns a mutable Tx document.
src/get-document.ts	Renames transaction accessors to getDocumentTx / getDocumentMaybeTx and binds mutations to Tx.
README.md	Updates documented function list to reflect new *Tx naming.
CLAUDE.md	Updates type naming reference for transaction variant.

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