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thePR0M3TH3ANandClaude Opus 5
12b945ca7e
Mutation testing found `token.expires_at <= now` could become `<` with every test still passing. The suite checked well before and well after expiry, which cannot tell the two apart — so a token was free to be usable for one more request than it claimed, which is the wrong direction for a credential. The daemon now takes an injectable clock, so the boundary can be asserted exactly rather than raced against wall time: at T-1 the token works, at exactly T it is refused. Every expiry decision AND every expiry assignment goes through that clock — a token issued against real time while checked against test time would never expire, which would have made the test meaningless. The TOTP timestamp-skew window uses it too, since a clock that moved one but not the other is a difference no production path should have either. Also pins the owner capability: an empty or absent capability is refused, and so is one of the right length but wrong content — the latter proving the constant-time comparison is what rejects it rather than the length check. One survivor is now recorded as genuinely unkillable rather than chased. `!presented || !this.capability` cannot change behaviour when flipped to `&&`, because the length comparison below rejects an empty string either way. The harness learned a `mutation-equivalent:` marker that must carry a REASON, so future survivor lists mean "look at this" instead of "this again" — and the judgement stays re-checkable rather than merely trusted. The harness also gained `--offset`, so a long target is measured in foreground-sized slices. That is a safety property, not a convenience: this script writes broken security code into the working tree, and it must never run unattended alongside commits again. agent slice 1 (mutants 1-6): 100% of viable mutants caught. Co-Authored-By: Claude Opus 5 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_01Vtx94nXDmNgXEeThUZP4QN