seonghobae · Aug 25, 2026 · Aug 20, 2026 · Aug 20, 2026 · Aug 20, 2026 · Aug 20, 2026
diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
@@ -43,6 +43,11 @@ flowchart LR
 
 Every boundary must be independently usable and expose versioned contracts for integration with organization repositories, `naruon`, and `contextual-orchestrator`.
 
+The `analysis_engine` vertical slice is intentionally separate from `tepp_api`:
+the API owns wire contracts while the engine owns deterministic execution. It
+does not replace the future topic or psychometric estimators and does not read
+another service's application tables.
+
 ## Implemented foundation topology
 
 Task 1 materializes the first storage-independent workspace boundaries. The
@@ -61,7 +66,8 @@ boundaries above remain the target modular MSA architecture.
 | `corpus_split` | cutoff-safe, relation-aware partitioning |
 | `tepp_simulation` | known-truth temporal/event data generation |
 | `validation_core` | RMSE, bias, coverage, graph, and Monte Carlo metrics |
-| `tepp_api` | versioned DTO, schema, and export contracts |
+| `tepp_api` | versioned DTO, schema, terminal-result, and export contracts |
+| `analysis_engine` | bounded cutoff-safe temporal evidence readiness execution and digest-bound terminal artifacts |
 | `location_membership` | location is not entity identity and not a language channel |
 | `prompt_source` | prompt boilerplate is not unique latent content and not stopword deletion |
 | `corpus_background` | corpus-background wording is not unique latent content and not stopword deletion |

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,17 @@ All notable changes to TEPP are documented here. The format follows Keep a Chang
 
 ### Added
 
+- Stacked `analysis_engine` vertical slice (ADR 0021): bounded Rust execution
+  from an accepted analysis run to a cutoff-safe, multiple-membership-aware,
+  SHA-256-digest-bound terminal artifact or redacted no-eligible-evidence
+  result. This remains active-PR evidence and does not claim estimator
+  authority.
+- `tepp_api` request-bound terminal analysis results and typed analysis-run
+  status/read responses: accepted/running states cannot carry measurement
+  evidence, and terminal results bind exact request and receipt identities.
+- Coverage classification now preserves multiline Rust `match` guard expression
+  lines while ignoring structural closing parentheses and match-arm labels.
+
 - `corpus_split` Unicode canonical identity: NFC/NFD-equivalent bodies produce `CanonicalEquivalent` leakage links and cannot occupy independent partitions; empty bodies and duplicate document identities fail closed (ADR 0004/0008/0013; PR #59).
 - `semantic_core` binds exact `evidence_core` source spans as semantic units. Language profiles are `unresolved` or a primary ISO 639 subtag with an IANA-registered ISO 3166-1 alpha-2 or UN M.49 region (RFC 5646; IANA File-Date 2026-08-08); private-use and unknown regions fail closed. Unresolved metadata keeps the caller-supplied Korean `측정` span and does not retokenize. `SemanticIdentity::from_language_tag` fails closed. Korean and English report sentences remain distinct units. Not concept alignment, not invariance, not a topic estimator (ADR 0020; issue #168). The APA register cites RFC 5646 once, in the Unicode/language-tags section; the slice-specific note remains `docs/research/span-grounded-semantic-units.md`.
 - `corpus_background` identity gate: corpus-level background wording is not unique latent content or a state transition; recovery tests distinguish background evidence from unique content.

diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -49,6 +49,7 @@ members = [
     "crates/interpretation_gateway",
     "crates/model_selection",
     "crates/checkpoint_authority",
+    "crates/analysis_engine",
 ]
 default-members = [
     "crates/evidence_core",
@@ -99,6 +100,7 @@ default-members = [
     "crates/interpretation_gateway",
     "crates/model_selection",
     "crates/checkpoint_authority",
+    "crates/analysis_engine",
 ]
 
 [workspace.package]

diff --git a/DOCUMENTATION.md b/DOCUMENTATION.md
@@ -42,6 +42,8 @@ TEPP's approved PRD v0.4 and implementation plan are the primary product baselin
 | Provider-payload minimization doctoring | [`docs/research/provider-payload-minimization.md`](docs/research/provider-payload-minimization.md) |
 | Adaptive orchestration router doctoring | [`docs/research/adaptive-orchestration-router.md`](docs/research/adaptive-orchestration-router.md) |
 | Hourly NIM OpenCode doctoring | [`docs/doctoring/hourly-nim-opencode-development.md`](docs/doctoring/hourly-nim-opencode-development.md) |
+| Analysis engine v1 doctoring | [`docs/doctoring/analysis-engine-v1.md`](docs/doctoring/analysis-engine-v1.md) |
+| Analysis engine gap-closure doctoring | [`docs/doctoring/analysis-engine-gap-closure.md`](docs/doctoring/analysis-engine-gap-closure.md) |
 | Corpus-split leakage-audit wire doctoring | [`docs/research/corpus-split-manifest-wire.md`](docs/research/corpus-split-manifest-wire.md) |
 | Unicode canonical-identity doctoring | [`docs/research/unicode-canonical-identity.md`](docs/research/unicode-canonical-identity.md) |
 | Change history | [`CHANGELOG.md`](CHANGELOG.md) |