quill: add evidence-checklist draft

wizard-work/quill/evidence-checklist.md

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+# Wizard Evidence Checklist
+
+Every claim in a draft or artifact must attach evidence before it ships.
+This checklist enforces the evidence law: prepared is not observed; a plan is not a build; "the executor said done" is not "a test passed."
+
+## Claim
+- [ ] One sentence: what is asserted.
+- [ ] No vague language ("seems", "likely", "probably").
+- [ ] If the claim includes a number, the unit and source are stated.
+
+## Source
+- [ ] Source is named: file path, URL, tool output, or person.
+- [ ] If from a tool call, the tool name and arguments are recorded.
+- [ ] If from a human, the timestamp and role are recorded.
+
+## Measured vs Claimed
+- [ ] Measured results are tagged with how they were obtained (command, test, observation).
+- [ ] Claimed-only items are explicitly labeled `CLAIMED` and include what would falsify them.
+- [ ] No claimed result is presented as if it were measured.
+
+## Reproducibility
+- [ ] Every measured result includes the exact command or procedure to reproduce it.
+- [ ] The reproduction target is current (not moved, renamed, or deleted).
+- [ ] If reproduction depends on environment, the env is specified.
+
+## Timestamp
+- [ ] Observation timestamp is ISO-8601 UTC.
+- [ ] Claims older than 24 hours without a fresh measurement are flagged.
+
+## Owner
+- [ ] A single owner is named for every claim.
+- [ ] The owner is the person or agent who observed the evidence, not the one who requested it.
+
+## Verdict
+- [ ] Verdict line starts with `VERDICT:` and states pass/fail with measured evidence.
+- [ ] Check command is a single bare shell command whose exit code equals the verdict.
+- [ ] No tautology: the command inspects the artifact, it does not echo a hard-coded success.