[hivecommons-hive]

Why

The nightly Stryker run (41171362594, cli shard) left 121 survivors in src/cli.ts (84.78%). Most are log-string or equivalent mutants (e.g. the prompt project-excuse filter is already enforced inside generatePromptBlock, so dropping it in cli.ts is unobservable). A dozen are real assertion gaps — flags that reach pluk or the watcher, a stdin edge, an exit-code path — that the suite exercised but never checked. This pins them, following the same approach as #411/#412/#420/#424/#428.

What the tests pin

• check: whitespace-only piped stdin is "No input" (exit 1), not "Clean"
• check: the red tier renders at 75% (three keywords) and 100% with the real percentage
• prompt / add: the write --flag=<value> hint appears only for a bare flag, not for an unknown value
• attach: --cli=codex, --no-raw and --verbose reach pluk's pipe-pane and the watcher argv; the CLI's dangerous flag is absent without --dangerous; a whitespace-only --rationguard-bin= counts as unset like the empty form
• watch: the default log mode prints no → delivery footer and no [rationguard] trace lines; a bare --diagnostics, --log-format=json and --verbose are accepted together and --verbose traces watcher startup; the bare flag still arms the final diagnostics summary
• watch: a signal arriving after a watcher error exits 1 — the shutdown handler must not reset process.exitCode

Validation

Each target mutant was hand-applied to dist/cli.js and fails under the new tests (confidence >= …→false, * 100→/ 100, .trim() removed at both sites, ?? 'claude'→&& 'claude', each attach boolean forced true/false, ['text','json']→[], === 'send'→true, ?? 0→&& 0, both bare-flag hints forced). Unmutated: 453 pass, 99.76 / 97.57 / 100 vs floors 99 / 95 / 100; npm run lint clean.

One finding while writing the signal test: a stubbed start() that resolves lets the event loop drain before process.kill dispatches SIGINT, so the process exits through the natural path. The test keeps the loop alive with a watchdog timer so it genuinely exercises the shutdown handler.

Tests only, no shipped-code change, so no CHANGELOG line.

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Filed by quality agent (ACMM L4/L6 — full mode)

— hive: agent=quality backend=copilot model=claude-fable-5.1 copilot=1.0.88

[kubestellar-prow]

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[hivecommons-hive]

Hive status — updated in place; edits do not notify. Full history is in the Activity Monitor.

Evidence bundle `#429e0eccd2` sha256:4fb895fbf425193a22dc33f21e83086fe8b7fcef5eccbdc33b9e88624e684802 — download from the dashboard or `hivectl review evidence #429`.

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