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Closes #2223. The write-path prior-art trigger's semantic arm shared auto-inject's 0.55 threshold, which was tuned on prose. Code embeddings sit on a much higher similarity floor — any two Python-shaped payloads share keywords, indentation and structure — so 0.55 landed INSIDE the noise band. Measured against the live instance: near-duplicate of a recorded helper 0.73-0.74 true positive unrelated colour math / Vue SFC / CSS 0.55-0.63 false positive `x = 1` 0.58 false positive 6 of 8 probe payloads produced a nudge; 4 were noise. The margin gate couldn't help — _AUTOINJECT_BAND is relative to the top hit, so with a single hit it never engages. Two gates are now the write-path arm's own: - kb_writepath_threshold, default 0.68 — above every measured false positive, still 0.05 below both true positives. Auto-inject keeps 0.55; it was tuned on prose and is not implicated. The comment this replaces explicitly reserved the split for when telemetry showed the surfaces wanted different values, so this is the change it described, not a reversal of it. - WRITEPATH_MIN_CODE_CHARS = 48 non-whitespace chars, below which the semantic arm doesn't run at all. Whitespace is excluded so a deeply indented one-liner can't pass on padding. 48 sits under the smallest plausible reusable helper (~60) and well over a degenerate edit, so it errs toward keeping recall — precision is the threshold's job. This is the cheap half of the operator's #89 idea; the full length<->threshold curve stays open there, since they asked to brainstorm it rather than have a scale invented for them. top_k stays shared — "how many titles at once" means the same thing on both surfaces. The existing tests were passing `code="x"` / `code="def f(): ..."` into the semantic arm, i.e. exactly the payloads the floor now drops, so the gate tests were never exercising a realistic payload. They now use a REAL_CODE fixture, plus new coverage for the floor (trivial payload, padding, place-arm unaffected, real helper passes) and a guard on the constant itself. Settings UI carries the new knob with the reasoning in its hint, and the write-path checkbox no longer claims it shares the threshold. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UaYUaouG9jjhATyuxCKrQs