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Milestone #271 steps 2 and 3. Neither changes what gets published. STEP 2 -- shadow mode. build.yml's sign-extension and ci.yml's extension-version guard now log the version that WOULD be derived from git history alongside the hand-maintained one. Nothing reads the derived value, and neither site can fail because of it. This exists because `web-ext sign` is one-shot per version: AMO 409s on a repeat, so a wrong formula burns a real version number that cannot be reclaimed. Comparing the two across real builds is the only way to validate it at zero cost. sign-extension runs on main only, so main pushes are the sole source of truth for whether the derived number moves exactly when the shipped extension changes -- the dev-side log is a convenience, not the evidence. sign-extension now checks out with fetch-depth: 0. The derived version is a commit count and a depth-1 clone cannot produce one. STEP 3 -- XPI content verification. Every other packaging assertion checks our declaration against itself. This is the first that asks web-ext what it ACTUALLY wrote into the archive. That assumption was both unverified and fragile: `test/**` only survives to web-ext because callers `set -f` before substituting it, so losing that quoting would silently start shipping dev files with no other signal. The step builds the XPI and asserts test/, scripts/, vitest.config.js, package.json, package-lock.json, README.md and node_modules are absent -- and, because an over-matching exclusion would break the extension at runtime rather than at build time, that manifest.json, all four lib/*.js and every UI directory are present. unzip is installed only when missing; node:24-bookworm-slim may not carry it. Refs #2399, #2400 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>