# S00 Handoff Packet

Status: Published (reconciled to reopened 20260219 sprint wave)
Date: 2026-02-19
Working directory: `docs/modules/ui/v2-rewire`
Sprint: `20260218_005`, task `R0-07`

## Purpose

This packet is the authoritative handoff from sprint `20260218_005` (Spec Freeze) to implementation sprints.
All frozen decisions are referenced here.

Implementation execution for this handoff was the reopened sprint set:

- `SPRINT_20260219_002` through `SPRINT_20260219_007`
- `SPRINT_20260219_008` (backend endpoint + migration dependency closure)
- `SPRINT_20260219_015` (Pack-13 promotions contract binding follow-on)

All completed sprint files from this set are now archived under `docs-archived/implplan/`.

## Frozen decisions

| Decision | Document | Key ruling |
| --- | --- | --- |
| Canonical IA taxonomy and root domain ordering | `source-of-truth.md` sections 2.1 and 2.2 | Seven roots: Dashboard, Release Control, Security and Risk, Evidence and Audit, Integrations, Platform Ops, Administration. Order is fixed. |
| Ownership boundaries (Policy, Trust, System, Security Data split) | `source-of-truth.md` section 2.2, `authority-matrix.md` section B | Policy Governance -> Administration. Trust and Signing -> Administration. System -> Administration. Legacy Security Data -> split: connectivity in Integrations/Platform Ops, gating impact in Security and Risk. |
| Superseded alternatives (forbidden placements) | `authority-matrix.md` section B; `S00_nav_rendering_policy.md` do-not list | Trust in Evidence, Policy in Release Control, System as top-level root are forbidden. |
| Release Control capability rendering policy | `S00_nav_rendering_policy.md` | Releases and Approvals may be direct nav shortcuts under Release Control group; Bundles, Deployments, and Environments stay grouped under Release Control ownership. |
| Advisory Sources screen ownership and spec | `S00_advisory_sources_spec.md` | Security and Risk owns decision-impact view. Integrations owns connector config. Platform Ops owns freshness ops. |
| Trust and Signing ownership transition and consumer model | `S00_trust_ownership_transition.md` | Administration is sole owner. Evidence and Audit and Security and Risk are consumers with read-only links only. |
| Route deprecation map and activation sequence | `S00_route_deprecation_map.md` | Complete v1 -> v2 mapping with per-sprint activation sequence. |
| Endpoint contract ledger v1 | `S00_endpoint_contract_ledger_v1.md` | 12 screen domains classified; previously missing rows `S00-T05-RC-01` and `S00-T05-SEC-02` are now reconciled to shipped backend contracts (`EXISTS_COMPAT`). |

## Downstream target sprints (executed and archived)

| Sprint | Dependency on S00 decisions | Unblocked after |
| --- | --- | --- |
| `SPRINT_20260219_002_FE_ui_v2_shell_navigation_and_route_truth` | Nav rendering policy, route deprecation map | `SPRINT_20260219_001` DONE |
| `SPRINT_20260219_003_FE_ui_v2_shell_release_control_structure` | Release Control ownership policy, Pack 12/13/14 structure, contract ledger RC rows | `SPRINT_20260219_002` |
| `SPRINT_20260219_004_FE_ui_v2_shell_security_and_advisory_sources` | Advisory Sources spec, ownership split, contract ledger SEC rows | `SPRINT_20260219_002` |
| `SPRINT_20260219_005_FE_ui_v2_shell_evidence_audit_structure` | Trust transition doc, evidence ownership policy, contract ledger EVID row | `SPRINT_20260219_002` |
| `SPRINT_20260219_006_FE_ui_v2_shell_integrations_platform_ops_alignment` | Integrations/Platform Ops taxonomy, security-data split policy | `SPRINT_20260219_002` |
| `SPRINT_20260219_007_FE_ui_v2_shell_qa_and_readiness_reverification` | Strict closure gate, ledger reconciliation, readiness publication | `SPRINT_20260219_003` to `SPRINT_20260219_006` |

## Unresolved risks (carry into implementation)

| Risk | Severity | Mitigation | Owner sprint |
| --- | --- | --- | --- |
| Bundle API (`S00-T05-RC-01`) contract drift after implementation | Medium | Keep ledger pinned to implemented `/api/v1/release-control/bundles*` routes and reject path regressions that collide with evidence bundle export namespace. | `SPRINT_20260219_008` + downstream QA |
| Advisory Sources cross-service composition drift (`S00-T05-SEC-02`) | Medium | Keep Concelier freshness and Policy impact/conflicts ownership split explicit; verify tenant/scope behavior in readiness reruns. | `SPRINT_20260219_008` + downstream QA |
| Trust scope model (`trust:read`, `trust:write`, `trust:admin`) requires Authority alignment | Closed (2026-02-19) | Authority canonical scopes and Platform trust policies are wired; A6 now includes owner mutation routes (`/api/v1/administration/trust-signing/{keys,issuers,certificates,transparency-log}`) with DB backing via migration `046_TrustSigningAdministration.sql`. | `SPRINT_20260219_016` |
| Approvals multi-tab fan-out latency (`S00-T05-APR-01`) | Medium | Preserve lazy loading and stale-data behavior in shell and add backend performance verification in follow-on integration work. | `SPRINT_20260219_003` |
| Data Integrity aggregate endpoint (`S00-T05-OPS-01`) spans modules | Medium | Keep ownership split explicit in shell and assign backend composition owner before full readiness GO. | `SPRINT_20260219_006` / `SPRINT_20260219_007` |
| Legacy alias removal can miss long-tail deep links | Low | Keep redirect map under strict tests and remove aliases only after measured traffic evidence. | `SPRINT_20260219_002` / `SPRINT_20260219_007` |

## Contract ledger sign-off status

- Frontend shell sign-off is complete through `SPRINT_20260219_006`.
- Backend dependency sign-off for previously unresolved rows (`S00-T05-RC-01`, `S00-T05-SEC-02`) is now complete via `SPRINT_20260219_008` evidence and ledger reconciliation.
- Promotions row `S00-T05-RC-02` and Administration row `S00-T05-ADM-01` are fully reconciled to `EXISTS_COMPAT` via `SPRINT_20260219_016` backend contract enrichment evidence.

## Non-shipped exploratory work

None.