Two pure-leaf follow-ups closing the Block H tail:
- base/reasoningEffort.ts: provider-aware reasoning_effort sanitation
(MISTRAL/GITHUB reject patterns, supportsMaxEffortForProvider,
sanitizeReasoningEffortForProvider). Deps are config/services only
(PROVIDER_CLAUDE, isClaudeCodeCompatible, supportsClaudeMaxEffort/supportsXHighEffort)
so the leaf never imports the host — no cycle. base.ts re-exports
sanitizeReasoningEffortForProvider for its external importers (mimoThinking + tests).
base.ts 1466 -> 1312 LOC.
- codex/tools.ts: Responses-API tool normalization (CODEX_HOSTED_TOOL_TYPES hosted-tool
passthrough, isCodexFreePlan gating, normalizeCodexTools). Self-contained
(console.debug only). codex.ts re-exports isCodexFreePlan + normalizeCodexTools for
external importers (tests + provider services). codex.ts 1430 -> 1268 LOC.
Byte-identical bodies (verbatim: base 100/100, codex 126/126); both leaves have zero host
imports. Adds two split-guards asserting the leaf owns the symbol and both import paths
resolve to the same function. Consumer tests stay green (base-executor-sanitize-effort 34,
executor-codex 40, mimoThinking 9, codex-free-plan-image-generation 3, issue-fixes 6).
Extract the pure upstream-header helpers (mergeUpstreamExtraHeaders, getCustomUserAgent,
setUserAgentHeader, applyConfiguredUserAgent, isOpenAICompatibleEndpoint,
stripStainlessHeadersForOpenAICompat) verbatim into the leaf base/headers.ts. base.ts is
imported by ~18 executors, so the host re-exports all 6 to keep those import paths intact;
it also imports the 4 it uses internally in the BaseExecutor class. The trivial JsonRecord
type alias is redefined locally in the leaf to avoid a base<->leaf cycle.
Host 1539 -> 1451 LOC. Byte-identical bodies (verbatim 78/78), leaf does not import the
host (no cycle). typecheck:core validates all base importers still resolve via the
re-export. Adds a split-guard; consumer tests stay green (executor-base-utils 22,
executor-default-base 49, executor-strip-stainless-openai-compat 6, plus executor sanity
via typecheck).
