fix(RovoDev): store binary bundle in global storage instead of per-workspace

[NSExceptional]

What Is This Change?

The Rovo Dev CLI binary bundle is downloaded into per-workspace storage (context.storageUri) instead of shared global storage. The bundle is version-pinned and byte-for-byte identical across workspaces — it contains a bundled Python 3.13 runtime, the full tree_sitter_language_pack, ripgrep, git-ai, native crypto/grpc libraries, and the atlassian_cli_rovodev binary (~366–435 MB per version).

Because it's keyed to each workspace, every workspace you open downloads and stores its own full copy. On my machine with 34 workspaces this added up to ~14 GB of duplicated binaries:

14.2 GB total across 34 workspaces
  22 × 202606.17.1  (435 MB each)  =  9.6 GB
   8 × 202604.30.2  (366 MB each)  =  2.9 GB
   4 × 202604.11.1  (366 MB each)  =  1.5 GB

I verified the copies are identical (same SHA-256 for atlassian_cli_rovodev across workspaces on the same version), so all but one copy per version is pure waste.

The fix:

1. Root the bundle at context.globalStorageUri instead of context.storageUri in GetRovoDevURIs. The code already nests the bundle under a per-version subdirectory (MIN_SUPPORTED_ROVODEV_VERSION), which is a safe global cache key, so the download now happens once per version and is shared across all workspaces. Nothing about the bundle is workspace-specific — the process is already launched with the workspace folder as cwd, which is unaffected. As a bonus this removes the context.storageUri! non-null assertion; storageUri is undefined when no workspace/folder is open, whereas globalStorageUri is always defined.

2. Automatically reclaim existing duplication. When Rovo Dev initializes in a workspace, any leftover bundle at the old per-workspace location (context.storageUri/atlascode-rovodev-bin) is removed. This is self-healing — each workspace cleans itself on next open — and uses only documented API, without reaching into other workspaces' storage folders (which VS Code provides no supported way to enumerate). Combined with VS Code's own garbage collection of storage for folders that no longer exist, no manual cleanup is required.

Storage footprint after this change: ~435 MB (one shared copy of the current version) instead of scaling linearly with the number of workspaces.

How Has This Been Tested?

• npm run lint — passes (also enforced by the pre-commit hook).
• npm run test:unit for src/rovo-dev/ — passes (9/9 in rovoDevLanguageServerProvider.test.ts; GetRovoDevURIs is mocked in the suite, so behavior is unchanged).
• TypeScript --noEmit typecheck — clean.
• Manual: confirmed existing per-workspace copies are byte-identical across workspaces, confirming the duplication and that a single shared copy is sufficient.

Note: the legacy cleanup is deliberately scoped to the current workspace on activation rather than walking the entire workspaceStorage tree, to avoid depending on undocumented on-disk layout. If maintainers would prefer a one-shot sweep of all workspaces, I'm happy to adjust.

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