docs: correct stale Default-OFF claim in retrieve_v2 docstring

[robotrocketscience]

Summary

retrieval.py:1870-1872 (inside the retrieve_v2 docstring, use_hrr_structural parameter description) still claimed "Default-OFF until the #437 reproducibility harness clears." That gate cleared at 11/11 and is_hrr_structural_enabled() (retrieval.py:818-848) has resolved to True for the no-override case since the #154 composition-tracker flip. The resolver's own docstring at lines 829-833 already documents this — only the consumer-side block in retrieve_v2 was stale.

Discovered while auditing v3.0.1 adapter defaults: the stale comment caused a false read that the structural lane shipped OFF.

Change

• Update the use_hrr_structural parameter block to state Default-ON, reference the cleared gate, and list the three opt-out paths (env var, kwarg, TOML).
• No behavior change.

Test plan

• git diff shows docstring-only change.
• grep confirms no test pins the old "Default-OFF until the [v2.0] Reproducibility harness — benchmarks/results/v2.0.0.json is canonical, uv sync && aelf bench all #437" wording.
• CI: staging-gate green (no code path touched).

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[robotrocketscience]

[claim:review:fermat:2026-05-14T04:27:08Z]

[robotrocketscience]

Rebased onto github/main (1 commit e7a521cb, signed G). Verified:

• Stale claim: only the retrieve_v2 docstring carried the Default-OFF until #437 wording. is_hrr_structural_enabled() at retrieval.py:825 returns True for no-override, and its own docstring (lines 829-833) already states post-flip behavior. PR closes the consumer-side gap.
• git grep 'Default-OFF until the #437' github/main returns only the line being edited.
• Diff is docstring-only — no behavior change, no code path touched.
• All required checks green after rebase (pytest 3.12/3.13, secrets-scan, pattern-scan, history-scan, CodeQL, deptry, vulture, typos, commit-msg-prefix, pr-title-prefix, pr-body-issue-link).
• Discretion grep on diff vs main: clean.
• Single commit signed.

Labeling ready-to-merge.

[github-actions]

merge-train: merged e7a521c → main via FF push.

[robotrocketscience]

[release:review:fermat:2026-05-14T04:33:05Z]