@W-20893788 Complete MRT API coverage with reorganized command structure

.changeset/mrt-command-reorganization.md

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+---
+'@salesforce/b2c-cli': minor
+---
+
+Reorganizes MRT commands by scope: project-level commands under `mrt project`, environment-level under `mrt env`, and deployment commands under `mrt bundle`. The `mrt bundle download` command now downloads files by default instead of just printing the URL.

.changeset/mrt-complete-coverage.md

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+---
+'@salesforce/b2c-cli': minor
+'@salesforce/b2c-tooling-sdk': minor
+---
+
+Adds complete MRT CLI coverage organized by scope: `mrt project` (CRUD, members, notifications), `mrt env` (CRUD, variables, redirects, access-control, cache invalidation, B2C connections), `mrt bundle` (deploy, list, history, download), `mrt org` (list, B2C instances), and `mrt user` (profile, API key, email preferences).

.changeset/mrt-push-to-bundle.md

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+---
+'@salesforce/b2c-cli': minor
+---
+
+Replaces `mrt push` with `mrt bundle deploy`. The new command supports both pushing local builds and deploying existing bundles by ID.