Reconcile Omarchy plugin install failures

[robzolkos]

What changed

• reconcile a failed omarchy plugin add with the running shell's plugin state
• accept the install only when 37signals.hey is present and enabled
• preserve the original failure and pending retry state when the plugin is absent or disabled
• cover the reported command-level outcome and successful Git progress output

Validation

• go test ./internal/cmd -run 'OmarchyPlugin|SetupOmarchy|SetupWizardStep3CloneFailure' -count=1
• make test
• make lint
• make build

Closes #467

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Summary by cubic

Stops omarchy plugin add failures from leaving an enabled plugin stuck in a pending retry state.

After an add error, the install now checks the shell's plugin state and succeeds when 37signals.hey is present and enabled. If the plugin is absent or disabled, the original failure and retry throttle stay intact.

Closes #467

^{Written for commit c53dd74. Summary will update on new commits.}

[Copilot]

Copilot review overview

🟢 Approved

The implementation is fail-closed, preserves retry behavior, and includes focused regression tests.

Review effort: Balanced
Findings: None

What changed in this PR

Reconciles failed Omarchy plugin commands with the shell’s actual plugin state, resolving #467.

Changes:

• Accepts installation when 37signals.hey is present and enabled.
• Preserves failure and retry state otherwise.
• Adds regression coverage for success, failure, and Git progress output.

[!TIP]
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File	Description
internal/​cmd/​omarchy_plugin.go	Verifies final plugin state after an add failure.
internal/​cmd/​omarchy_plugin_test.go	Covers reconciliation and Git progress scenarios.

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