[Jammy2211]

Summary

Phase A0a(ii) of the search-extensibility epic (PyAutoFit#1671): the backend-execution layer of the search conformance suite. Tests only. Stacked on #1672 (A0b): this PR's base is feature/search-ext-a0b-hygiene because it asserts A0b's Drawer/NullPaths and samples_from repairs; merge #1672 first, then this one (GitHub retargets it to main when the base branch goes). Shipped under the human's 2026-10-08 --auto launch; tier judge.

• New test_autofit/non_linear/search/test_conformance_backend.py over the 15-search roster at PYAUTO_TEST_MODE=1, fits cached once per module: (a) real DirectoryPaths fit asserting the exact output file set inside the zip, (b) completed-path resume (_fit call counter 1 then 0), (c) NullPaths fit returns a Result with samples, (d) samples_from(model, None) raises its real error and falls back only on FileNotFoundError/NotImplementedError with the WARNING, (e) frozen samples_info key sets per search plus a shared family core.
• conformance_roster.py gains the declared capability attributes layer (i) left out: jax_use (none/optional/required) and jax_modules. Golden table unchanged.
• Coverage contract in the module docstring: every backend executes on the full-extras legs; on unittest-nojax searches skip by declared capability only, never importorskip.

Six strict xfails for real library bugs, each naming its repair phase:

1. DynestyStatic, DynestyDynamic → A3: after a completed fit samples_via_internal_from(None) reads savestate.save, which output_search_internal deletes, so a restored folder always falls back to samples.csv.
2. Emcee, Zeus, BlackJAXNUTS, SMC → A4: the auto_correlation_settings=AutoCorrelationsSettings() default is built at import time, so test mode's check_size=1 only applies when PYAUTO_TEST_MODE is set before import.

One test-side workaround follows from item 2: Emcee gets a fresh AutoCorrelationsSettings() built under test mode, or a 10-step chain crashes in emcee.autocorr. Documented in the module. Minor findings not tested: Drawer's samples_info["time"] is None even with real paths; NSS writes "time" as a float where every other search writes a string.

API Changes

None (tests only).

Test Plan

• New module alone: 134 passed, 6 xfailed, ~55 s
• pytest test_autofit/non_linear/search -x: 604 passed, 1 skipped, 9 xfailed
• Full pytest test_autofit -x: 3207 passed, 2 skipped, 9 xfailed
• unittest-nojax emulated: 71 passed, 65 skipped (exactly NSS, BlackJAXNUTS, SMC, MultiStart×4, all by declared capability), 4 xfailed (re-run by the reviewing session)
• CI green on unittest 3.12 / 3.13 / nojax and docs

Full API Changes (for automation & release notes)

Removed

• none

Added

• none (test roster attributes only)

Migration

• none

Validation checklist (--auto run — plan was not pre-approved)

• Effective level: safe (header: safe, cap: test → safe)
• Plan: on the issue (test: search conformance suite layer (ii), backend execution (search-extensibility A0a(ii)) #1671), written at start, unmodified since
• Gate: tests 3207 pass / 2 skip / 9 xfail (+ nojax emulation) · smoke n/a (tests only) · review CLEAN (Fable session over the Opus-written branch; witness basis-cited: nojax emulation re-run shows the seven required searches skipping by capability and 71 passing; importorskip absent from code) · Heart STALE release validation incomplete: no rehearsal for current source
• Human: plan sound in hindsight?
• Human: diff matches plan (no scope creep)? Check the six xfails' phase assignments
• Human: merge after refactor: search hygiene and dead code (search-extensibility A0b) #1672, then log the outcome

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