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* test(compression): TDD failing tests for hard-budget post-pass (#17) node:test suite for applyHardBudget — targetTokens, targetRatio, no-op, force-preserve, determinism, both-wins, techniquesUsed, integration seam. All tests fail (module not yet created) — TDD red step. * feat(compression): hard-budget post-pass (#17) — compress to exactly N tokens - types.ts: add targetTokens? and targetRatio? to CompressionConfig after contextBudget - hardBudget.ts: applyHardBudget(body, {targetTokens?,targetRatio?}) → CompressionResult; splits prose into sentences/lines, ranks by avg scoreToken ascending, drops lowest- saliency units until ≤ target; UNIT_PRESERVE_RE guards numbers/URLs/errors/code; targetTokens wins when both set; techniquesUsed:["hard-budget"] - strategySelector.ts: hard-budget post-pass in runStackedCompression + runStackedCompressionAsync after engine loop, before finalizeStackedResult; gated on config.targetTokens || config.targetRatio; mergeStackStep + compressed=true * fix(compression): preserve digit-less sensitive lines in hard-budget UNIT_PRESERVE_RE only matched digits/URLs/error-headers/code-fences, so stack-trace at-frames, key=value credential lines, and digit-less paths were droppable and could be cut to hit the budget. Add specific anchors (^\s*at\s, \/[\w.-]+\/, [A-Za-z_]\w*=\S) that never match a bare end-of-sentence period (which would re-break the feature into a no-op). Regression tests drive each unit to target=1 (drops every non-preserved unit) and assert the sensitive line survives; plus a guard that plain prose ending in a period stays droppable. * fix(compression): distribute hard-budget across messages + warn when unreachable Two related correctness fixes in applyHardBudget: - Aggregate target was passed verbatim to compressText for EACH message, so an N-message body could come back ~N× over budget. Distribute the target proportionally per message (floor(target * msgTokens/total)) so the SUM stays <= target. - When every unit is preserve-guarded (or a single oversized preserved unit), the result still exceeds target with no signal. Measure the result and push a validationWarnings entry when it remains over budget, so callers are not silently left over the limit. Regression tests: a 4-message body with target 200 ends with TOTAL <= 200; an all-numeric (all-preserved) body emits the 'could not reach target' warning. * fix(compression): run hard-budget post-pass when targetTokens/targetRatio is 0 The seam gate used `||`, so targetTokens:0 or targetRatio:0 (both falsy) silently skipped the post-pass in runStackedCompression and runStackedCompressionAsync. Switch to `!= null` so an explicit 0 still engages the pass. Regression test: applyStackedCompression with config.targetTokens:0 must report 'hard-budget' in techniquesUsed. * docs(changelog): restore hard-budget bullet (#17, eaten by rebase)