fix: raise project-memory budget ratio to 0.25

At 0.15 the effective per-call allowance (450 - 55 wrapper) was 395
chars, which is just under the length of a real paragraph-length
project memory (~400 chars). Verified on live p04 probe: band was
still absent after the flat-budget fix because the first memory
entry was one character too long for the budget.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/atocore/context/builder.py

@@ -34,7 +34,7 @@ MEMORY_BUDGET_RATIO = 0.10  # 5% identity + 5% preference
 # for the Phase 9 reflection loop on the retrieval side. Budget sits
 # between identity/preference and retrieved chunks so a reinforced
 # memory can actually reach the model.
-PROJECT_MEMORY_BUDGET_RATIO = 0.15
+PROJECT_MEMORY_BUDGET_RATIO = 0.25
 PROJECT_MEMORY_TYPES = ["project", "knowledge", "episodic"]
 
 # Last built context pack for debug inspection