[daggerok]

What changed

iShares gets the shared updater blocks of the ETF template (.claude/tools/etfs/etf-std/*.block.ts, applied with apply-block.ts, byte-identical in every brand), wired as in Schwab #75. iShares has no N-PORT code and no Yahoo history window, so nport-reader and windowed-chart are left out; pages keep the array-row format:

• holdings-guard (Q24): an all-non-numeric weight sheet never replaces a published sheet with numeric weights, even with numeric and sum relaxed (previousWeights from the published holdings pages)
• calendar-dates: isoDate and the Performance and Distributions date parsing read calendar text (was Date.parse(text + ' UTC')); withoutYoungMetrics nulls the 1y, 3y, 5y, 10y and annualized since-inception returns of a fund younger than the horizon (calendar anniversary of the catalog inception date); the 12-contiguous-month rule for since-inception stays
• fund-selection (Q27, Q28): a TICKERS entry outside the live catalog and the published funds stops the run before any fund request (closed published funds stay valid); a catalog-only row the live catalog no longer lists is always dropped, also when the vanished-funds safety keeps the other rows; NEW FUNDS: names a fund on its first successful publish, NEW FUNDS (not published yet): a new fund whose first read failed (before: every catalog ticker missing from the previous index)
• Brand ticker hygiene (PS-1 rule, 2330 in Taiwan and Saudi funds): a holdings Ticker is kept only for a security on a U.S. exchange (the sheet's own Exchange column); foreign local codes, futures, options, swaps, FX and cash lines become -. iShares sheets carry no CUSIP or ISIN, so the Watchlist then keys those rows by name

Values that change on the next run: international and global funds publish - instead of local codes for every non-U.S. listing (EFA: 670 of 680 rows), U.S. funds only for futures, cash and unlisted lines (IVV: 5 rows, among them ESZ6, USD and the delisted HOLX); NEW FUNDS lines change as above

How it was checked

• bun test: 42 pass, 0 fail (exit 0), also with the control variables of update-data.config.json exported; the new Q24, Q27, Q28, young-fund and dates tests fail without their wiring (checked by removing each piece)
• bun build --target=bun scripts/update-data.ts --outfile=/dev/null, bun build --target=bun src/main.tsx --outfile=/dev/null, git diff --check, hub check-readme.ts, check-scripts.ts, apply-block.ts --check holdings-guard,calendar-dates,fund-selection
• .claude/tools/etfs/tc/check.sh: no new errors (53 -> 53 pre-existing lines)
• live run (data discarded): TICKERS="IVV EFA AGG IAU" -> 3 updated, 1 unchanged, only the ticker change above plus fresh upstream values