Update survey roadmap: mark 10b shipped, add 10e simulation details

[igerber]

Summary

• Mark Phase 10b (research-grade survey DGP) as shipped with parameter summary
• Add four specific simulation study scenarios for 10e position paper, including conditional PT as a required DGP extension
• Genericize co-authorship suggestion in 10e (no specific names)

Methodology references

• N/A — documentation only, no methodology code changes

Validation

• No test changes — documentation only

Security / privacy

• Confirm no secrets/PII in this PR: Yes

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[github-actions]

Overall Assessment

✅ Looks good

Executive Summary

• This is a documentation-only PR in docs/survey-roadmap.md#L140; I found no estimator, weighting, inference, or default-behavior code changes in scope.
• The new “10b shipped” summary matches the implemented generate_survey_did_data() surface in diff_diff/prep_dgp.py#L1163 and the corresponding test coverage in tests/test_prep.py#L1512.
• The methodology-specific details touched by the new text are already documented in the Methodology Registry at docs/methodology/REGISTRY.md#L2518, so I did not find any undocumented deviation.
• The new 10e wording correctly treats conditional_pt as a missing future DGP extension rather than implying current support in docs/survey-roadmap.md#L148.
• No code quality, performance, security, or documentation/test blockers were introduced by the diff.

Methodology

No findings.

Methods affected: none; this PR updates roadmap text only. The new 10b status is consistent with the implemented DGP parameters and behavior in diff_diff/prep_dgp.py#L1184, diff_diff/prep_dgp.py#L1258, and diff_diff/prep_dgp.py#L1670, plus existing tests in tests/test_prep.py#L1559, tests/test_prep.py#L1589, tests/test_prep.py#L1759, and tests/test_prep.py#L1792. The registry already documents the icc calibration and informative-sampling-with-covariates behavior in docs/methodology/REGISTRY.md#L2520 and docs/methodology/REGISTRY.md#L2526, so there is no undocumented mismatch.

The new 10e language also stays within documented methodology boundaries: it marks conditional_pt as future work in docs/survey-roadmap.md#L199, and it does not conflict with the already-documented conservative reg+covariates deviation in docs/survey-roadmap.md#L246 and docs/methodology/REGISTRY.md#L438.

Code Quality

No findings. Markdown-only edits; no new code paths or anti-patterns were introduced.

Performance

No findings. No runtime code changed.

Maintainability

No findings. The updated roadmap text is aligned with current implementation and existing methodology notes rather than creating a competing description.

Tech Debt

No findings. The only unresolved item introduced by the text is the future conditional_pt DGP extension, and it is explicitly tracked in the roadmap itself at docs/survey-roadmap.md#L148.

Security

No findings. No executable code, dependencies, secrets, or data-handling logic changed.

Documentation/Tests

No findings. No new tests are required for this docs-only PR, and the substantive roadmap assertions are already backed by existing DGP tests in tests/test_prep.py#L1512. Residual risk is limited to ordinary documentation drift because roadmap pages are manually maintained.