Rewrite v1+dev FSC cases with pack-grounded tokens drawn from
en_core_cognition_v1. Closes the 9/9 region-construction failure
recorded in Phase 4 (chain_tokens alpha/beta/gamma/delta/etc. were
ungrounded in the active pack).
Token mappings preserve each case's test pattern:
* alpha→beta→gamma→delta → tone→evidence→memory→wisdom (causes)
* mu→nu→omicron → voice→memory→wisdom (means)
* pi→rho→sigma→tau → question→answer→understanding→wisdom (precedes)
* upsilon→phi→chi → word→discourse→narrative (part_of)
* eta/theta/zeta + means-distractors → symbol/word/meaning + image/light
Result post-rewrite:
* skipped_count: 9/9 → 0/9 (region constructible)
* causal_attribution_valid: True (preserved)
* code_path_residual: 0.0 (preserved)
* inner_loop_t0 hash stability: 1.0 (preserved)
* best_separation_quality: 0.0 → 0.056 (still below 0.8 gate)
The rewrite exposes a deeper architectural finding documented in the
ADR addendum: v1/dev case schema (prime + chain_tokens) probes
teaching-driven walk (ADR-0022/0023), not the inner-loop's
blade-admissibility mechanism (ADR-0024). The Phase 2 corpus-
observation runner's reuse of v1/dev was a categorical error.
v1/dev belong to the boundary-walk lane (runner.py); v2 belongs to
the inner-loop lane (v2_runner.py). Phase 5 will author the benign
inner-loop corpus the EXHAUSTION_CEILING gate was designed against.
Tests pinning new state:
* TestV1ChainBladeUngrounded → TestV1ChainBladePostGrounding
(assertions inverted: skipped_count == 0; separation_quality < 0.5)
* TestPhase2 (unchanged) continues to assert causal_attribution_valid
and hash stability; exhaustion remains a finding, not an invariant.
Flag-gated semantic change to generate(): when
inner_loop_admissibility=True and a non-unconstrained region is
supplied, each per-step selection is re-evaluated by check_transition
with admissibility_threshold; rejected candidates are excluded and
the walk re-selects until admitted or every admissible candidate is
exhausted (ValueError = honest refusal, same shape as ADR-0022 §2).
Default False — every legacy call site keeps ADR-0023 boundary-only
semantics, and the new AdmissibilityTraceStep.rejected_attempts field
is folded into canonical() only when non-empty, so trace_hash bytes
are byte-identical with ADR-0023 turns.
Invariants preserved: rotor V is only built for the admitted
candidate, so versor_condition < 1e-6 still holds at propagate_step;
no new normalization site; no new I/O / dynamic imports.
Tests: tests/test_inner_loop_admissibility.py covers the four
acceptance properties — default off preserves behavior, rejection
drives re-selection, exhaustion raises ValueError, empty
rejected_attempts is omitted from canonical(). Full pytest: 927
passed, 1 pre-existing unrelated failure (test_language_pack_cache).
