fix(scripts): emit 'Copied plan template' status in setup-plan.ps1 (parity with bash)

[jawwad-ali]

Description

setup-plan.sh prints a status message after copying the plan template on a fresh run:

cp "$TEMPLATE" "$IMPL_PLAN"
if $JSON_MODE; then echo "Copied plan template to $IMPL_PLAN" >&2
else echo "Copied plan template to $IMPL_PLAN"; fi

The PowerShell twin setup-plan.ps1 emitted nothing on the successful-copy path — only the Plan already exists skip message and the Plan template not found warning had equivalents. So on a first run the two scripts had a divergent status-output contract (the bash behavior is even covered by a test, test_setup_plan_json_parseable_on_first_run, which asserts Copied plan template on stderr).

Fix

Emit the same message after WriteAllText, routed exactly like the sibling Plan already exists message — [Console]::Error.WriteLine in -Json mode so stdout stays pure JSON, Write-Output in text mode. Mirrors the bash wording and stream routing. One source file.

Testing

• uvx ruff check clean; tests/test_ps1_encoding.py green (edited .ps1 stays ASCII / PowerShell 5.1-safe).
• New test_ps_setup_plan_copied_message_on_stderr_in_json_mode mirrors the existing bash test_setup_plan_json_parseable_on_first_run: asserts -Json first-run stdout is parseable JSON and Copied plan template is on stderr.
• Verified fail-before / pass-after locally with Windows PowerShell 5.1: before, stderr is empty and the test fails; after, the message is on stderr and stdout remains pure JSON ({...,"BRANCH":""}). Existing setup-plan tests still pass.

AI Disclosure

• I did use AI assistance (describe below)

Found and fixed with Claude Code (Claude Opus 4.8) under my direction. AI located the missing status message across the bash/PowerShell twins and drafted the fix plus a mirroring regression test; I confirmed the bash wording/stream routing, verified fail-before/pass-after under Windows PowerShell 5.1 (stdout stays pure JSON), and reviewed the diff before submitting.

[Copilot]

Pull request overview

This PR aligns the PowerShell setup-plan.ps1 status-output behavior with the bash setup-plan.sh twin by emitting a “Copied plan template …” message on first-run successful template copy, while preserving “pure JSON on stdout” behavior in -Json mode.

Changes:

• Emit “Copied plan template to …” after writing plan.md from the template in setup-plan.ps1, routed to stderr in -Json mode and stdout in text mode.
• Add a regression test ensuring PowerShell -Json first-run output remains parseable JSON on stdout while the “Copied plan template” status message is emitted on stderr.

Show a summary per file

File	Description
tests/test_setup_plan_no_overwrite.py	Adds a PowerShell parity regression test for “Copied plan template” stderr status in -Json mode while keeping stdout JSON-only.
scripts/powershell/setup-plan.ps1	Emits the “Copied plan template …” status message after a successful template copy with stream routing matching the bash script’s contract.

Review details

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• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Low

[mnriem]

Thank you!