# Latticra Runtime Boundary Implementation

Status: initial implementation record
Scope: C runtime boundary API surface, deterministic labels, default-deny classification, no-effect allow-mode classification, allowed-effect report field, authority prerequisites, authority flag report fields, authority label report fields, Nucleus task prerequisites and happy path, Nucleus task flag report fields, render/Lat/LIR prerequisite status report fields, render/Lat/LIR prerequisite denials and happy paths, runtime identity copying, source metadata copying, future-gate classification, expanded report fields, invariant tests, caller-provided report buffer, no-effect posture, and non-claims.

## Purpose

This document records the first runtime boundary implementation surface.

The implementation follows:

```text
docs/RUNTIME_BOUNDARY_CONTRACT.md
docs/RUNTIME_BOUNDARY_IMPLEMENTATION_PLAN.md
```

This slice adds the public runtime boundary API, source file, invariant tests, and test runner.

The current source is no-effect and disabled-by-default. It does not implement operational runtime behavior.

## Implementation files

This slice includes:

```text
include/latticra/runtime_boundary.h
src/runtime_boundary.c
tests/runtime_boundary_invariants.c
tests/runtime_boundary_effect_flag_report.c
tests/runtime_boundary_allowed_effect_report.c
tests/runtime_boundary_authority_flag_report.c
tests/runtime_boundary_authority_label_report.c
tests/runtime_boundary_abuse_case_fixtures.c
tests/runtime_boundary_task_flag_report.c
tests/runtime_boundary_prerequisite_status_report.c
tests/runtime_boundary_prerequisite_denial.c
tests/runtime_boundary_allow_modes.c
tests/runtime_boundary_prerequisite_happy_paths.c
tests/runtime_boundary_task_report_happy_path.c
scripts/test-runtime-boundary.sh
docs/RUNTIME_BOUNDARY_IMPLEMENTATION.md
```

## Implemented surface

The public API defines request kinds, effects, modes, policies, denial labels, gate states, operator-confirmation metadata, authority summary metadata, request records, result records, classifier entry point, and report entry point.

The source provides:

```text
deterministic request/effect/mode/policy/denial/gate/operator labels
default-deny classification
no-effect report-mode allow classification
no-effect validation-mode allow classification
no-effect classification-mode allow classification
allowed-effect report visibility
runtime_id copying
record_count initialization and report visibility
authority presence and status checks
authority no-effect flag checks
authority execution/mutation/server/recovery/hardware flag report visibility
authority status label, validator label, requested-effect label, and denial-reason report visibility
Nucleus task-result prerequisite checks for task-report requests
Nucleus task-report happy path when task metadata is OK and report mode matches
task policy and task reason metadata copying
task executed/mutation/server/recovery/hardware flag copying and report visibility
render status/error metadata copying and report visibility
render-report prerequisite denial when render metadata is missing or failed
render-report happy path when render metadata is OK and report mode matches
Lat parser status/error metadata copying and report visibility
Lat validation prerequisite denial when Lat metadata is missing or failed
Lat validation happy path when Lat metadata is OK and validation mode matches
LIR status/error metadata copying and report visibility
LIR validation prerequisite denial when LIR metadata is missing or failed
LIR validation happy path when LIR metadata is OK and validation mode matches
source identity copying
source span metadata copying
unknown request denial
unknown effect denial
future-gate classification for operational request kinds
operator-confirmation non-override behavior
bounded report output with policy, reason, and gate state
expanded report output for runtime_id, record_count, request, requested effect, allowed effect, mode, operator confirmation, authority status, authority label strings, authority no-effect state, authority effect flags, task policy, task reason, task effect flags, render prerequisite status, Lat prerequisite status, LIR prerequisite status, no-effect flag, execution flag, mutation flag, file I/O flag, network flag, server flag, recovery flag, rollback flag, hardware flag, boot flag, source identity, and source span metadata
small-buffer rejection and clearing
```

## Validation

Run:

```sh
sh scripts/test-runtime-boundary.sh
```

The runtime boundary tests verify:

```text
runtime boundary classification initializes a no-effect result
runtime boundary abuse-case fixtures deny unknown request, unknown effect, future-gated execution, operator override, missing task metadata, missing authority metadata, invalid LIR prerequisites, and blocked effects
runtime_id is copied from request to record
record_count is initialized
runtime_id and record_count report fields are present
requested-effect and allowed-effect report fields are present
matched no-effect report mode allows report requests
matched no-effect validation mode allows validation requests
matched no-effect classification mode allows classification requests
valid render metadata allows render-report in report mode
valid Lat parser metadata allows Lat validation in validation mode
valid LIR metadata allows LIR validation in validation mode
valid Nucleus task metadata allows task-report in report mode
mismatched modes remain denied
default policy denies
source identity metadata is copied
source span metadata is copied
missing authority is denied
failed authority status is denied
non-no-effect authority flags are denied
authority effect flags are present and zero in reports
authority label strings are present in reports
missing Nucleus task metadata is denied for task reports
valid Nucleus task metadata is copied for task reports
Nucleus task effect flags are copied and visible in reports
render/Lat/LIR prerequisite status fields are visible in reports
failed render metadata is denied with render-failed
failed Lat metadata is denied with parser-failed
failed LIR metadata is denied with lir-failed
unknown requests are denied
unknown effects are denied
operational request kinds require a future gate
operator confirmation does not override policy
runtime boundary reports are bounded
expanded report fields are present
source identity and source span report fields are present
file I/O, network, server, recovery, rollback, hardware, and boot report flags are present and zero
small buffers are rejected and cleared
null arguments are handled safely
```

## Boundary

This implementation does not provide runtime behavior, command behavior, Lat execution, LIR execution, task effect execution, live movement, state mutation, file I/O, network I/O, server interaction, self-update, recovery behavior, rollback, hardware support, boot behavior, terminal control, security isolation, sandboxing, malware prevention, ransomware prevention, or operating-system completeness.

## Note

The fuller classification policy remains specified in the contract and implementation plan. This source slice expands the public C API behavior while preserving the denied-by-default runtime boundary.