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emozilla
c0b64f0877
Three issues flagged by the Copilot review on this PR: 1. Double JSON emit on stage failure (Copilot #1, #2). When -Stage <name> ran a worker that threw, Invoke-Stage's finally emitted a JSON result frame AND the entry-point catch emitted a second error frame -- producing two concatenated JSON objects on stdout and breaking the one-line-per-invocation contract that drivers parse against. Same issue applied to -Json mode on a full install (every stage's finally plus a final error frame missing duration_ms/skipped). Fix: Invoke-Stage's finally now sets $script:_StageEmittedErrorFrame when it emits a failure frame; the entry-point catch checks the flag and skips its own emit, still exit 1. 2. $prevEAP uninitialized on early try-block throw (Copilot #3). In Install-Uv, Test-Python, Test-Node's winget fallback, _Run-NpmInstall, and the playwright block, '$prevEAP = $ErrorActionPreference' lived as the first statement INSIDE the try. If anything between 'try {' and that line threw (Write-Info on an unusual host, the npx-finding loop, etc.), the catch's 'if ($prevEAP) { ... }' restore was a no-op and EAP could remain relaxed. Fix: hoist '$prevEAP = $ErrorActionPreference' to the line immediately before 'try {' in all five sites. Catch's restore is now always meaningful regardless of where in the try the throw originated. No change to Invoke-Stage's success path or to the four lint-clean EAP sites (Test-Node was the only winget-related catch). All 19 metadata smoke tests still pass.