Reset this machine's local Singularity state

Output contract: Let the CLI validate and mutate state; preserve its exact result, warnings, publication status, artifacts, and next actions. For suggested actions, pair Shell with the returned Copilot command; honor commandGuidance. If absent, say "Copilot: no verified equivalent"; never invent a slash command.

Boundary: machine-local; no repository or Story required. Use explicit arguments or SFlow-returned paths; never search $HOME or infer a repository.

This is not a repository factory reset and not a product reinstall. Prefer
--forget-only when the contributor wants to remove this machine's registrations,
caches, credentials, sessions, onboarding and personalization without deleting any
workspace, clone, branch, worktree, dirty file, manifest, or repository-local
recovery record. With no mode flag, the compatibility mode physically deletes only
workspace directories whose registry entry and regular workspace.json manifest
prove that Singularity manages the exact path.

1. Establish the intended mode. Use --forget-only unless the contributor explicitly
   asks to delete physical workspace directories and their clones.

2. Run singularity-flow local-reset [--forget-only] --dry-run --json with the exact
   same mode that will be applied.

3. Show mode, every entry in workspaces, missingRegistrations, remove, and
   preserve. State the exact number of physical workspace directories scheduled
   for deletion or preservation.

4. The contributor must explicitly provide the exact confirmation value from
   the preview. Never generate or supply it yourself.

5. Only after that separate answer, run the same mode:

   singularity-flow local-reset [--forget-only] --confirm "<EXACT CONFIRMATION>" --json

   FORGET LOCAL authorizes only --forget-only; RESET LOCAL authorizes only
   physical workspace deletion. Never substitute one for the other.

6. Report that installed product surfaces remain available and the next action is
   to create or open a workspace.

Never delete an unregistered path, bypass a manifest mismatch, run from inside a
workspace being removed, uninstall product components, or convert the request into
factory-reset, reset-all, or fresh-install.