Fullcode Guidance Closure (2026-04-24)

Change: execute-fullcode-guidance-20260410

Closure decision:

Archive the change without further H2/H3 tuning.
Treat the fullcode branch as a completed research/diagnostic line, not the production-critical path.

Why this branch is being closed:

The sequence completed the high-value semantic repairs (B1 to B4) and established correct stitched-OOS evaluation semantics.
Subsequent H1 ladder attempts produced limited or negative incremental value under the project guardrails.
The lighter regime-lite branch achieved a validated promotion result on real PIT data and now serves the project’s practical end-state more directly.

Implication for project convergence:

Fullcode remains available as a reference research branch.
The project’s preferred operational baseline is now the validated lite runtime profile promoted_fast_entry_hold3.
Further fullcode policy tuning is intentionally out of scope unless a future project-level failure reopens that path.