feat(cli): Remove Taskless from unchecked tool locations

[thecodedrift]

Make the taskless init wizard's tool-selection step manifest-aware so unchecking a location removes Taskless's stubs from it. This makes it easy to centralize on one location (e.g. .agents/) and drop the shims from other tools.

Previously the multiselect pre-checked detected tools only. A location Taskless had installed into — notably .agents/, which has no detection signal of its own — would render unchecked, so it could not be meaningfully unchecked. The install engine already performs manifest-diffed, target-scoped removal behind a confirm prompt; that path was simply unreachable from the UI because the manifest never reached the multiselect's pre-checked state.

What changes:

• The tool-selection multiselect pre-checks the union of manifest-recorded and detected directories, so an installed location shows checked and can be unchecked.
• Each entry carries an origin hint: installed (in the manifest, takes precedence), detected, or not detected.
• The removal confirmation is itemized per target (e.g. "Remove Taskless from .claude/ (2 stubs)?") instead of a generic single-line prompt.

The removal engine itself (applyInstallPlan, computeInstallDiff) is unchanged — this only surfaces existing capability. The non-interactive init --no-interactive / update paths and the canonical .taskless/ store are untouched. Full uninstall (removing the canonical store) is explicitly out of scope.

Review notes:

• locationChoices is kept pure — promptLocations does the manifest I/O and passes the target list in, so the detection-and-manifest-to-choices mapping stays unit-testable.
• One known edge case left as a follow-up: on a legacy v0.6→v0.7 upgrade the canonical .taskless target has skill removals, so the itemized prompt would read "Remove Taskless from .taskless/ (N stubs)" — slightly off wording for canonical full files. Harmless and out of scope here.

The OpenSpec change artifacts (openspec/changes/uninstall-unchecked-locations/) are included for the proposal, design, and cli-init spec delta.

[Copilot]

Pull request overview

This PR updates the interactive taskless init wizard to make install-location selection “manifest-aware”, so locations that Taskless previously installed into are pre-checked and can be unchecked to trigger the existing manifest-diff removal behavior. It also improves the summary-step removal confirmation by itemizing removals per target directory with stub counts.

Changes:

• Make locationChoices pre-check the union of detected tool directories and manifest-recorded install targets (excluding the canonical .taskless store), and add installed/detected/not detected origin hints.
• Update promptLocations to read install state and pass manifest targets into locationChoices.
• Itemize the summary removal confirmation message per target (with tests + end-to-end coverage for “uncheck removes stubs” and “decline keeps stubs”).

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/cli/src/wizard/steps/locations.ts	Reads install state and pre-checks union of detected + manifest targets; adds origin hints.
packages/cli/src/wizard/steps/summary.ts	Builds an itemized “remove stubs” confirmation message from diff entries.
packages/cli/test/wizard-steps.test.ts	Adds unit tests for manifest-aware pre-checking and itemized removal confirm message.
packages/cli/test/wizard-integration.test.ts	Adds end-to-end coverage for uninstall-on-uncheck and decline-keeps-stubs flows.
openspec/changes/uninstall-unchecked-locations/**	Proposal/design/spec/task artifacts documenting the behavior change.
.changeset/uninstall-unchecked-locations.md	Patch changeset describing the CLI behavior update.

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