13 TANF-linkage formulas should read cycle-safe computed state enrollment, not the reported is_tanf_enrolled input

The populace#591 consumer classification (adjudication: https://github.com/PolicyEngine/populace/issues/591#issuecomment-5160668979) read all 65 consumers of the reported-enrollment input `is_tanf_enrolled` against their statutory references. 52 correctly key on administrative participation status (categorical eligibility/exemptions, applicant-vs-recipient tests) where a reported input is the right model. **13 consumers key on a legal concept that computed state-program enrollment can safely supply** — for these, reading the frozen reported input makes reforms fail to propagate where they lawfully should.

Proposed fix: cycle-safe state enrollment helpers, conceptually:

```python
if parameters(period).gov.hhs.tanf.abolish_tanf:
return False
return (
spm_unit("", period) > 0
) & spm_unit("takes_up_tanf_if_eligible", period.this_year)
```

(person formulas via `person.spm_unit(...)`; generic annual `tanf` is NOT a safe substitute — it sums every state program and re-enters the nationwide TANF/child-care/Medicaid graph).

The 13 substitution sites: IA CCA (`ia_cca_income_exception.py:20` → computed `ia_fip` enrollment), ID ICCP (`id_iccp_copay_per_child.py:79` → person-projected `id_tafi`), IN CCDF (`in_ccdf_parent_in_eligible_activity.py:28` → person-projected `in_tanf`), LA CCAP (provisional — also requires unmodeled STEP participation; see caveats), MI CCAP (`mi_ccap_income_waived.py:29` → computed `mi_fip`), MS CCPP ×2 (`ms_ccpp_copay_waived.py:22`, `ms_ccpp_categorically_eligible.py:17` → computed `ms_tanf`), ND CCAP ×2 (`nd_ccap_copay.py:35`, `nd_ccap_parent_in_eligible_activity.py:31` → computed/person-projected `nd_tanf`), OK STC (`ok_stc.py:70` → tax-unit aggregation of computed `ok_tanf`), PA CCW (`pa_ccw_eligible.py:19` → negated computed `pa_tanf`), SC CCAP (`sc_ccap_copay.py:34` → computed `sc_tanf`), TX CEAP (`tx_ceap_eligible.py:36` → computed `tx_tanf`).

Full per-consumer receipts with statutory citations in the adjudication link. Related metadata gaps found in the same sweep (worth fixing alongside): `ca_tanf_financial_eligible`, both CO countable-income consumers, and the NC gross-unearned consumer lack reference metadata; KS activity metadata cites KEESM 2810 while the formula comment cites 2820; the KY income consumer omits its categorical-path citation.

Start with the 13 substitution sites listed in the issue and read the linked populace adjudication for the statutory receipts. Trace each consumer's current is_tanf_enrolled use and the named state-program variable, including the LA CCAP STEP caveat. Done means the affected formulas use cycle-safe computed or person-projected state enrollment without substituting generic annual tanf, while preserving the documented exceptions.

Written by the indexing model from the issue text.