# Archive Index — Confidence Engine

> Archived means retained as historical evidence and excluded from normal context loading. It does not mean deleted, rejected or necessarily incorrect for its time.

All files below were moved from `docs/` on 2026-08-06 by Experiment 29 to reduce the default reading burden while preserving full traceability.

## Archived Files

| Original Path | Archive Path | What It Contains | Why Archived | When to Consult |
|---|---|---|---|---|
| `docs/v0.4-handoff.md` (258 lines) | `docs/archive/v0.4-handoff.md` | Historical handoff document from the v0.4 transition; references CaseOrchestrator API. | Architecture has evolved since v0.4. Documented for reference only, not active guidance. | When tracing the origin of case-orchestration patterns or investigating historical API design decisions. (Also referenced in `docs/orchestrator-contract.md`.) |
| `docs/v0.4-route-status.md` (25 lines) | `docs/archive/v0.4-route-status.md` | Historical route tracking for the v0.4 release cycle. | Current routes differ entirely from v0.4. Retained as a record of early routing assumptions. | When investigating why certain routing decisions were made in early versions. |
| `docs/v0.5-release-notes.md` (58 lines) | `docs/archive/v0.5-release-notes.md` | Release notes documenting the state of v0.5. | Historical record only. Nothing active depends on this content. | When comparing v0.5 to later releases or verifying what was known at that release time. |
| `docs/v0.6-ambiguity-generalisation.md` (40 lines) | `docs/archive/v0.6-ambiguity-generalisation.md` | v0.6 experiment on ambiguity generalisation. | Superseded by later reasoning architecture decisions from Experiments 15–25B. | When investigating the intellectual history of how the engine handles ambiguous inputs. |
| `docs/v0.7-observation-report.md` (136 lines) | `docs/archive/v0.7-observation-report.md` | Experimental observation snapshot from v0.7 UX work. | Useful as a reference but not a current working document. UX work is paused. | When reviewing past UX observations that may inform future interface design decisions. |
| `docs/archive/deferred-ux-backlog.md` (376 lines) | `docs/archive/deferred-ux-backlog.md` | Deferred and exploratory UX ideas from original `docs/backlog info.md` (lines 21–390). Retained for historical reference. Not commitments, priorities or active tasks. | Superseded `docs/backlog info.md`. Deferred UX planning separated from mock reference in Experiment 31. | When a named past UX idea from the deferred backlog is being reviewed; not loaded by default. |

## Phase 2B Experiment Archives (2026-08-19)

All files below were classified `HISTORICAL_EVIDENCE + SAFE` during the Phase 1B/2B context audit and moved to reduce default reading burden while preserving full traceability. They are preserved evidence — not discarded, obsolete, or invalidated. Load only when a specific historical question requires them.

| Subdirectory | What Was Moved | Count |
|---|---|---|
| `docs/archive/experiments/reasoning-fidelity-v0.8/` | Experiment 56 family (reasoning-fidelity v0.8 pass) | 11 files (experiment-56a–m, excluding c) |
| `docs/archive/experiments/semantic-action-contract/` | Experiment 58 family (semantic action contract) | 8 files (experiment-58a1–a6, b1–b2) |
| `docs/archive/experiments/question-formulation/` | Experiment 59 family (question formulation) | 7 files (experiment-59a1–a3, b1–b4) |
| `docs/archive/experiments/decision-options/` | Experiment 60A family (decision options analysis) | 7 files (experiment-60a1–8, excluding a3) |
| `docs/archive/experiments/decision-closure-integration/` | Experiment 60B subfamilies {10–15}, {55–82}, {95,97,100} | 35 files (experiment-60b{10-15}, {55-56,58-82}, {95,97,100}) |
| `docs/archive/experiments/knowledge-mgmt/` | Cold-start validation historical evidence | 1 file (cold-start-validation.md) |
| `docs/archive/experiments/context-routing/` | Document-role review (classification/routing analysis) | 1 file (document-role-review.md) |
| `docs/archive/experiments/pre-RTO/` | Pre-Return-to-Origin experiments and version-specific docs: v0.5–v0.7 | 7 files (pre-RTO experiments + release notes/UX pass) |

**Not moved in Phase 2B:** checkpoint-60b93.md, docs/design-evolution-log.md, docs/investigation-state-assessment*.md, architectural-principles.md, v0.6-reasoning-architecture.md, success-signals.md, failure-modes.md, investigation-narrative.md, behaviour-selection.md, orchestrator-contract.md, reasoning-contract-backlog.md, reasoning-refinement-requirements.md, reasoning-production-path-map.md.

**Phase 2D experiment archives (2026-08-19):** After Phase 2C carry-forward verification confirmed all three families SAFE for archival:

| Subdirectory | What Was Moved | Count |
|---|---|---|
| `docs/archive/experiments/post-v0.8-investigation/` | Experiment 57 family (post-v0.8 investigation) | 69 files (experiment-57* family) |
| `docs/archive/experiments/decision-closure-integration/` | Experiment 60B subfamilies {1–8}, {19–48} | 37 files (experiment-60b{1-8}, experiment-60b{19-48}) |

## Superseded Files

The following files were superseded by a structured split in Experiment 31 and are no longer in use. Their contents remain fully represented in the documents below.

| Original Path | Archive Paths (superseding) | Note |
|---|---|---|
| `docs/backlog info.md` (390 lines) | `docs/ui-mock-reference.md` (mock fixtures), `docs/archive/deferred-ux-backlog.md` (deferred UX planning) | Superseded 2026-08-06. Split into task-specific mock reference and deferred backlog archive. See Experiment 31 entry in design-evolution-log.md for content accounting. |

## Usage

Load these files only when a specific experiment, version history, or past decision requires them. Use this index to locate archived material — do not read the archive directory by default.