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ADR-857 rollout phase 2e — the largest core.cts extraction. Move the configuration-loading subsystem (loadConfig + _getConfigDefault/ _getNestedConfigDefault/CONFIG_DEFAULTS/_deepMergeConfig, isGitIgnored + _gitIgnoredCache, _warnUnknownProfileOverrides + RUNTIME_OVERRIDE_TIERS + the dedup Sets, _resetRuntimeWarningCacheForTests) out of core.cts into a new leaf module src/config-loader.cts. core.cts re-exports the public surface (loadConfig, isGitIgnored, CONFIG_DEFAULTS, RUNTIME_OVERRIDE_TIERS, _resetRuntimeWarningCacheForTests); 12+ callers unchanged. Cycle-free: config-loader imports only leaves (configuration, config-schema, planning-workspace, shell-command-projection, core-utils, model-catalog). All core-internal helpers loadConfig touches moved with it to avoid a cycle. core keeps CANONICAL_CONFIG_DEFAULTS for its model-resolver functions, which now resolve loadConfig via the binding — this unblocks the final model-resolver extraction (2f). core.cts: 1275 -> 792 lines. Repointed tests/config-field-docs.test.cjs (a docs-parity source check) to read the CONFIG_DEFAULTS literal from its new home (config-loader.cjs). New-CLI-module checklist done (.gitignore, eslint, INVENTORY 95->96 + row, manifest, ARCHITECTURE, CONTEXT.md "Config Loader Module"). Adds tests/config-loader.test.cjs (27 tests: behavioral + shim-identity + adversarial config fixtures). Gates: lint, code-review, security-review (prototype-pollution guard confirmed intact), codex adversarial-review (0 findings; byte-identical move). Mac 4115 pass; clean-build docker: full-suite hit the local mirror's known incremental-tsc non-determinism on an unrelated re-exported symbol (findPhaseInternal, from already-merged 2d), but a clean targeted rebuild of the affected file passed 163/0 — CI's clean full matrix is the authoritative gate. Closes #885 Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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