[Jammy2211]

Summary

PR 1b of results-library phase 1 (#1739). Stacked on #1743; merge that first.

Zipped results are now read in place, with nothing extracted to disk:

• ZipMember (aggregator/zip_member.py): a pathlib-like path into a zip. Unlike zipfile.Path it holds no open file: each open reopens the zip, and zipfile keeps the stream valid after the ZipFile closes. Aggregating thousands of zips therefore never hits the open-file limit. Member names are cached per (size, mtime).
• FileOutput / SearchOutput read through path.open(), so SearchOutput.from_zip(zip_path) works unchanged; FITS members load from memory.
• SearchOutput.open_member(path) is public.
• value(name, kind=...) (report P15) picks between tracer.json and tracer.fits. A bare ambiguous name keeps today's order (json, pickle, csv, fits) and warns once, so existing scripts behave the same.
• Aggregator.from_index(roots, index_dir=None, states=("completed",)) aggregates over the results index and leaves superseded results out by default.

Test plan

• ZipMember path semantics; a zipped fixture reads the same as the folder fixture (id, model, search, children, json/fits values); open_member; value(kind=) and the ambiguity warning; from_index on real fits with extractall/extract patched to raise and the tree byte-identical afterwards.
• Full PyAutoFit suite (see comment).

Refs #1739

🤖 Generated with Claude Code

[Jammy2211]

Full PyAutoFit suite (PyAuto313, local) on 1a and 1b: 4,010 / 4,015 passed, the one failure was the 600-line decomposition guard on abstract_search.py (fixed in b2630e5; guard + results tests 41 passed after). The conformance file set now lists files/dataset_identity.json (1934430). Smoke on the 1b head: autofit, autogalaxy, autolens, autolens_test, euclid, howtolens — 167 PASS, 0 FAIL (autocti legs not runnable on this laptop: GSL headers missing, unrelated). Heart STALE (release validation only) acknowledged by the human for this ship.