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* feat(workspace): layered memory with sensitivity-based privacy redirect Introduce MemoryLayer type for named memory layers with sensitivity levels and write permissions. Layers map to synthetic user_id values in workspace tables, enabling shared/private memory isolation. - Add MemoryLayer, LayerSensitivity types with default_for_user() - Add layer-aware write methods (write_to_layer, append_to_layer) - Add PatternPrivacyClassifier to guard shared layer writes - Add optional 'layer' parameter to memory_write tool and HTTP API - Add 'redirected' and 'actual_layer' fields to write response - Add MEMORY_LAYERS env var (JSON) for layer configuration - Workspace user_id now derived from GATEWAY_USER_ID (was hardcoded "default") - 10 integration tests for layered memory operations Addresses prerequisite for Issue #59 (multi-tenancy). Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: add explicit default to memory_write layer schema Add "default": "private" to the layer parameter's JSON schema so LLM tool consumers can see the default without reading code. Co-Authored-By: Claude Opus 4.6 <[email protected]> * refactor: extract resolve_layer_target to deduplicate layer writes Consolidate shared layer-lookup, writable check, and privacy classification logic from write_to_layer and append_to_layer into a single resolve_layer_target helper. Flagged on #349 review — the duplication originates in this PR. Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: address review feedback on layered memory PR - Fix email regex pipe bug in TLD character class (privacy.rs) - Add append support to web memory_write handler via `append` field - Validate MemoryLayer name/scope: reject empty, check duplicates - Remove hardcoded 'private' default from tool schema; omit layer fields from output when no layer specified - Document scope isolation risk for multi-tenant (Issue #59) Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: address adversarial review findings - CRITICAL: fix identity file protection bypass via trailing slash (normalize target path before protection checks) - HIGH: check private layer is writable before privacy redirect - HIGH: map LayerNotFound/ReadOnly to proper 4xx HTTP status codes - HIGH: honor `append` field in non-layer HTTP write path - MEDIUM: remove redundant DB fetch in append_to_layer (narrower TOCTOU window) - MEDIUM: remove dead memory_write_handler from handlers/memory.rs Co-Authored-By: Claude Opus 4.6 <[email protected]> * feat: opt-in privacy classifier, force override, confidence scoring Address review feedback from @zmanian: - Privacy classifier is now opt-in via with_privacy_classifier() instead of always-on. Default hardcoded patterns (doctor, therapy, email, phone) had unacceptable false positive rates in household contexts. LLM chooses the correct layer via system prompt; regex can't improve on that. - Add ConfigurablePrivacyClassifier for operator-supplied patterns. - PatternPrivacyClassifier defaults narrowed to hard PII only (SSN, credit card, credentials). - Add force param to write_to_layer/append_to_layer to skip classifier. - PrivacyClassifier trait returns SensitivityResult { is_sensitive, confidence } instead of bool, ready for probabilistic classifiers. Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: remove redundant heartbeat match arm in memory_write The heartbeat arm was identical to the catch-all — resolved_path already points to paths::HEARTBEAT when target is "heartbeat". Addresses review feedback from gemini-code-assist on #1112. Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: return Result from PatternPrivacyClassifier::new() Replace .expect() with proper error propagation per project no-panics policy. Remove Default impl (unused in production). Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * refactor: move memory_layers from GatewayConfig to WorkspaceConfig Resolve merge conflicts between HEAD (transcription, search, env helpers) and the workspace config branch. GatewayConfig no longer owns memory_layers; WorkspaceConfig::resolve() handles parsing, validation (name length >64, character set, empty scope, duplicates), and fallback defaults. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * test: strengthen privacy classifier and layer isolation coverage Add 8 privacy classifier edge case tests (format variants, keywords, longer documents, empty/partial inputs) and 5 layer write isolation integration tests (cross-scope invisibility, overwrite, empty path, sensitive-to-private no-redirect). Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * fix: tautological test assertion and add WorkspaceConfig validation tests Replace always-true `is_ok() || is_err()` in write_empty_path_to_layer with actual behavior assertion (write succeeds with normalized empty path). Add 8 unit tests for WorkspaceConfig::resolve() covering valid JSON parsing, invalid JSON, empty/long/invalid-char layer names, empty scopes, duplicates, and default fallback behavior. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * style: cargo fmt after staging merge Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> --------- Co-authored-by: Claude Opus 4.6 <[email protected]> Co-authored-by: [email protected] <[email protected]>