[spark-compete] fix: silent uv pip to python -m pip rewrite without warning

[yossweh]

[spark-compete] fix: silent uv pip to python -m pip rewrite

pr_author: yossweh
repo: vibeforge1111/spark-cli
Team: hellenagent (hellen, yossweh, exelchapo)

actual_behavior

When install_command_argv rewrites a uv pip command to python -m pip, it does so silently without informing the user. Users may not realize their explicit uv pip invocation was changed, leading to confusion about which pip is being used.

expected_behavior

The rewrite from uv pip to python -m pip should emit a stderr warning so the user knows the command was rewritten and why, and can use pip directly to avoid the warning.

repro_steps

1. Run a spark-cli install command that uses uv pip install
2. Observe that the command is silently rewritten to python -m pip install
3. No warning or message is shown to the user about the rewrite

before_after_proof

Before: uv pip rewrite to python -m pip happens silently. After: a stderr warning is printed explaining the rewrite and suggesting to use pip directly.

tests_or_smoke

Verify that running a uv pip install command produces a stderr warning about the rewrite; verify that direct pip commands do not trigger the warning.

duplicate_notes

Files touched by this PR: src/spark_cli/cli.py — exclusively the install_command_argv function (lines ~5929–5934), adding a print(..., file=sys.stderr) in the if executable == "uv" branch.

Why no other PR covers this fix:

• PR [spark-compete] fix: TOCTOU race in atomic_write_json symlink check #273 touches src/spark_cli/cli.py but modifies atomic_write_json (line ~1779) — a security-hardening change to symlink re-checks, completely unrelated to install command rewriting.
• PR [spark-compete] fix: load_module crashes on missing or malformed spark.toml #277 touches src/spark_cli/cli.py but modifies load_module (line ~1796) — TOML manifest parsing error handling, not install command logic.
• PR [spark-compete] Fix managed npm fallback for Windows runtime commands #391 fixes managed npm fallback for Windows runtime commands — it touches the npm branch of install_command_argv, not the uv branch. It does not add any warning for uv pip rewrites.
• PR [spark-compete] fix: reject Node v23.x in installer, require v22.12+ or v24+ #358 rejects Node v23.x in the installer — this is installer-level logic in install.sh, not cli.py rewrite logic.
• PR [spark-compete] fix: approval.py misses curl -d --data-raw --data-urlencode and wget --post-file --body-file upload flags #464 adds upload flag detection to approval.py — different file entirely (approval.py vs cli.py).
• PR [spark-compete] Preserve Windows runtime command paths #353 preserves Windows runtime command paths — concerns path resolution, not uv pip rewrite visibility.

What this PR uniquely fixes: This is the only PR that adds a user-facing stderr warning to the uv pip → python -m pip rewrite branch in install_command_argv. No other open PR modifies the if executable == "uv" code path. Without this PR, users who explicitly request uv pip install have zero visibility into the silent command substitution, which can cause confusing install behavior when uv's sandbox is silently bypassed and a different pip executable is used instead. The fix is necessary because silent command mutation violates user intent expectations — users deserve to know when their explicit tool choice is being overridden.

risk_notes

No secrets, CI workflows, dependency files, or prompt surfaces changed. Adds a user-facing stderr warning to an existing rewrite path. No security or privacy implications.

review_claim

• impact_claim: medium
• evidence_types: redacted_terminal_excerpt, smoke_test
• review_state_requested: pr_review

packet

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[vibeforge1111]

Spark Compete reset status: Gate review still pending.

This PR is currently in the needs-account-verification bucket. Please follow the reset instructions in #295 before expecting points, merge review, or Mac lab work.

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[yossweh]

Updated this PR body to match the public Spark Compete reset template more closely:

• added a valid spark-compete-hotfix-v1 packet shape
• filled branch / repo / owner-surface fields
• replaced placeholder test text with bounded verification notes
• added duplicate-search notes referencing adjacent PRs and reset issue Spark CLI competition PR reset instructions #295
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[vibeforge1111]

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[vibeforge1111]

Spark Compete duplicate/material-value review: this PR needs a clearer material-new-value claim before it can move past duplicate review.

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[vibeforge1111]

Spark Compete review status

PR: #275
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