fix(airlock): Round 8 polish and 1.4.0 release prep — exception hygie…

CHANGELOG.md

@@ -33,7 +33,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `sovereign-sdk-runtime`, and `sovereign-sdk-edge` internal dependency declarations
   updated to reference the new `sovereign-sdk-*` distribution names at `>=1.3.0`.
 
-## [Unreleased]
+## [1.4.0] — 2026-07-05
 
 ### Added
 
@@ -135,6 +135,33 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
     `from_sieve_output()`.  Content expansion (sieved > raw) clamps to `0.0`; impossible
     inversion (negative `optimized_token_count`) clamps to `100.0`.
 
+  - **`AirlockPolicyViolation.warnings` diagnostic attribute** (`exception.py`,
+    `boundary.py`): `AirlockPolicyViolation.__init__` now accepts an optional
+    `warnings: list[str] | None` parameter; accumulated pre-sieve `warn`-action messages
+    are stored as `self.warnings: list[str]`.  When `AirlockBoundary.process()` raises
+    `AirlockPolicyViolation` on a post-sieve deny verdict, it passes `verdict.warnings`
+    so callers can programmatically inspect pre-sieve diagnostic context via `exc.warnings`
+    without losing it at the exception boundary.
+
+  - **`AirlockConfigurationError` de-duplication** (`policy.py`): Since
+    `AirlockConfigurationError` extends `ValueError`, clean validation errors raised inside
+    `_parse_rule` were being caught by the broad `except (KeyError, TypeError, ValueError)`
+    handler in `PolicyEngine.__init__` and re-wrapped with a redundant "Invalid rule
+    definition" prefix.  An explicit `except AirlockConfigurationError: raise` guard now
+    lets those errors surface natively with their original message intact.
+
+  - **SPDX license metadata** (`pyproject.toml`): `project.license` migrated from
+    deprecated TOML table form (`{ text = "MIT" }`) to SPDX string literal (`"MIT"`).
+    Deprecated `License :: OSI Approved :: MIT License` classifier removed.  Eliminates
+    two `SetuptoolsDeprecationWarning` emissions that become hard build errors after
+    2027-02-18.
+
+  - **PEP 517 build validation**: `uv build --package sovereign-sdk-airlock` clean-room
+    pass produces `sovereign_sdk_airlock-1.4.0.tar.gz` and
+    `sovereign_sdk_airlock-1.4.0-py3-none-any.whl` with no editable-path or direct-url
+    leakage.  Wheel METADATA confirmed: all `Requires-Dist` entries, `Description-Content-Type:
+    text/markdown`, and full `README.md` long-description body (3,401 bytes, UTF-8).
+
 - **Phase 9.5 — `sovereign-edge` sensor ingestion bridge** (new workspace member
   `packages/sovereign-edge/`): Introduces the middleware pipeline that intercepts
   sealed sensor wire frames from `sovereign-sensor`, applies the `sovereign-sieve`

README.md

@@ -257,6 +257,7 @@ try:
     # result.policy_warnings                         — non-fatal warn-rule messages
 except AirlockPolicyViolation as exc:
     # Payload blocked by a deny rule — do not transmit
+    # exc.warnings carries any pre-sieve warn-rule messages accumulated before the deny
     raise
 ```
 

ROADMAP.md

@@ -1300,11 +1300,22 @@ result = await boundary.process(normalize_openai(request))
   `sieved_content`, `telemetry`, `receipt`, and `policy_warnings`
 * [x] `AirlockPolicyViolation(RuntimeError)` and `AirlockConfigurationError(ValueError)`
   (`exception.py`) — domain exceptions for deny-action enforcement and configuration
-  invariant violations respectively
+  invariant violations respectively; `AirlockPolicyViolation.__init__` accepts optional
+  `warnings: list[str] | None` (default `[]`) stored as `self.warnings`, preserving
+  pre-sieve `warn`-action diagnostic context when a post-sieve deny fires
+* [x] `AirlockConfigurationError` de-duplication (`policy.py`) — explicit
+  `except AirlockConfigurationError: raise` guard in `PolicyEngine.__init__` prevents
+  clean boot-time validation errors raised by `_parse_rule` from being caught and
+  re-wrapped by the broad `except (KeyError, TypeError, ValueError)` handler (since
+  `AirlockConfigurationError` extends `ValueError`)
 * [x] `packages/sovereign-airlock/pyproject.toml` — workspace member at version
   `1.4.0`; runtime dependencies: `sovereign-sdk-core>=1.3.0`,
-  `sovereign-sdk-ledger>=1.3.0`, `sovereign-sdk-sieve>=1.3.0`, `pyyaml>=6.0`
-* [x] 83-case test suite across four files (`TestAirlockTelemetry`: 12;
+  `sovereign-sdk-ledger>=1.3.0`, `sovereign-sdk-sieve>=1.3.0`, `pyyaml>=6.0`;
+  `license` migrated from deprecated TOML table form to SPDX string literal (`"MIT"`);
+  deprecated `License :: OSI Approved :: MIT License` classifier removed; PEP 517 build
+  validated via `uv build --package sovereign-sdk-airlock` — clean sdist and
+  pure-Python wheel produced with no editable-path or direct-url leakage
+* [x] 84-case test suite across four files (`TestAirlockTelemetry`: 12;
   `TestPolicyLoading` + `TestRawScopeEvaluation` + `TestFieldsScopeEvaluation` +
   `TestTelemetryScopeEvaluation` + `TestGlobalCeiling`: 35; `TestReceiptBuilder`: 11;
   `TestAirlockBoundaryHappyPath` + `TestAirlockBoundaryPolicyDenial` +

packages/sovereign-airlock/README.md

@@ -90,6 +90,20 @@ rules:
 | `warn` | Appends to `AirlockResult.policy_warnings`; transmission continues |
 | `deny` | Raises `AirlockPolicyViolation`; payload blocked |
 
+### Exception Inspection
+
+When a post-sieve `deny` rule fires, any `warn`-action messages accumulated during the
+pre-sieve pass are preserved on the exception for diagnostic inspection:
+
+```python
+try:
+    result = await boundary.process(payload)
+except AirlockPolicyViolation as exc:
+    print(exc)           # deny violation message
+    print(exc.warnings)  # pre-sieve warn messages (list[str], may be empty)
+    raise
+```
+
 ---
 
 ## Transport Normalisation

packages/sovereign-airlock/pyproject.toml

@@ -8,15 +8,14 @@ version = "1.4.0"
 description = "Model-neutral outbound governance boundary for sovereign perimeter inspection, policy enforcement, and evidence generation"
 readme = "README.md"
 requires-python = ">=3.12"
-license = { text = "MIT" }
+license = "MIT"
 dependencies = [
     "sovereign-sdk-core>=1.3.0",
     "sovereign-sdk-ledger>=1.3.0",
     "sovereign-sdk-sieve>=1.3.0",
     "pyyaml>=6.0",
 ]
 classifiers = [
-    "License :: OSI Approved :: MIT License",
     "Programming Language :: Python :: 3.12",
     "Intended Audience :: Developers",
     "Topic :: Security",

packages/sovereign-airlock/src/sovereign_airlock/boundary.py

@@ -143,7 +143,10 @@ async def process(self, payload: NormalizedPayload) -> AirlockResult:
         # Post-sieve: evaluate telemetry rules requiring actual sieve output
         post_verdict = self._policy.evaluate_post_sieve(telemetry)
         if not post_verdict.allowed:
-            raise AirlockPolicyViolation("; ".join(post_verdict.violations))
+            raise AirlockPolicyViolation(
+                "; ".join(post_verdict.violations),
+                warnings=verdict.warnings,
+            )
         verdict.warnings.extend(post_verdict.warnings)
 
         # Component D: Evidence generation — non-fatal on any failure

packages/sovereign-airlock/src/sovereign_airlock/exception.py

@@ -10,8 +10,25 @@ class AirlockPolicyViolation(RuntimeError):
 
     :param message: Human-readable description of the policy rules that were violated.
     :type message: str
+    :param warnings: Non-fatal ``warn``-action messages accumulated prior to the deny,
+        preserved here for caller diagnostics.  Empty list when none were collected.
+    :type warnings: list[str] | None
     """
 
+    warnings: list[str]
+
+    def __init__(self, message: str, warnings: list[str] | None = None) -> None:
+        """
+        Initialise the violation exception with violation message and optional prior warnings.
+
+        :param message: Human-readable description of the policy rules that were violated.
+        :type message: str
+        :param warnings: Non-fatal ``warn``-action messages accumulated before the deny verdict.
+        :type warnings: list[str] | None
+        """
+        super().__init__(message)
+        self.warnings = list(warnings) if warnings is not None else []
+
 
 class AirlockConfigurationError(ValueError):
     """Raised when a policy YAML configuration file is missing, malformed, or structurally invalid.

packages/sovereign-airlock/src/sovereign_airlock/policy.py

@@ -133,6 +133,8 @@ def __init__(self, config_path: str | Path) -> None:
         for rule_def in raw.get("rules") or []:
             try:
                 self._rules.append(self._parse_rule(rule_def))
+            except AirlockConfigurationError:
+                raise
             except (KeyError, TypeError, ValueError) as exc:
                 raise AirlockConfigurationError(
                     f"Invalid rule definition {rule_def!r}: {exc}"