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c089ca9d1a
Two related root causes in the stacked compression pipeline:
- #6479/#6491: a dispatched step whose engine legitimately finds nothing
eligible (session-dedup with no repeated blocks, ccr below its min-chars
threshold) returns `{ stats: null }`. `mergeStackStep()` silently dropped
that step from `engineBreakdown` with zero trace — no warning, no error.
Now records a `"<engine>: skipped (no eligible content)"` validation
warning for any null-stats step, covering every engine that follows this
convention (session-dedup, ccr, headroom, relevance, llm, llmlingua,
ionizer, readLifecycle), not just the two reported.
- #6480: `finalizeStackedResult` ran the aggregate `guardPipelineInflation`
check unconditionally, even when the loop-level `compressed` flag stayed
false (no step ever advanced `currentBody`). Since tokens are trivially
equal when nothing ran, the guard mislabeled a genuine no-op as
`fallbackApplied: true` with a misleading "reverted to original" warning.
Extracted the guard into `applyStackedInflationGuard()` in
`pipelineGuards.ts` (keeps `strategySelector.ts` under its frozen line
budget) and gated it on `compressed === true`.
Also fixes `compression-pipeline-inflation-guard.test.ts`'s wire test,
which passed a bare engine-id string to the pipeline; `normalizePipelineStep()`
only recognizes a fixed set of built-in string aliases and silently
downgrades any other string to `{ engine: "caveman" }`, so the test's
custom inflating engine was never actually exercised. Passing a step object
restores the test's original intent.
New regression tests: tests/unit/compression/repro-6479-6491-null-stats-silent-drop.test.ts,
tests/unit/compression/repro-6480-noop-guard-misfire.test.ts.