diff --git a/openspec/changes/add-debug-logs-specfact-home/CHANGE_VALIDATION.md b/openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/CHANGE_VALIDATION.md
similarity index 100%
rename from openspec/changes/add-debug-logs-specfact-home/CHANGE_VALIDATION.md
rename to openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/CHANGE_VALIDATION.md
diff --git a/openspec/changes/add-debug-logs-specfact-home/design.md b/openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/design.md
similarity index 100%
rename from openspec/changes/add-debug-logs-specfact-home/design.md
rename to openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/design.md
diff --git a/openspec/changes/add-debug-logs-specfact-home/proposal.md b/openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/proposal.md
similarity index 100%
rename from openspec/changes/add-debug-logs-specfact-home/proposal.md
rename to openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/proposal.md
diff --git a/openspec/changes/add-debug-logs-specfact-home/specs/debug-logging/spec.md b/openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/specs/debug-logging/spec.md
similarity index 100%
rename from openspec/changes/add-debug-logs-specfact-home/specs/debug-logging/spec.md
rename to openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/specs/debug-logging/spec.md
diff --git a/openspec/changes/add-debug-logs-specfact-home/tasks.md b/openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/tasks.md
similarity index 97%
rename from openspec/changes/add-debug-logs-specfact-home/tasks.md
rename to openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/tasks.md
index 825743b..7e6ec37 100644
--- a/openspec/changes/add-debug-logs-specfact-home/tasks.md
+++ b/openspec/changes/archive/2026-01-29-add-debug-logs-specfact-home/tasks.md
@@ -31,7 +31,7 @@
 - [x] 4.1.3 In `src/specfact_cli/commands/backlog_commands.py`, when debug is on, log file read/write for export/import (path, prepared/finished/failed, status, error).
 - [x] 4.1.4 In `src/specfact_cli/commands/init.py`, when debug is on, ensure template resolution steps are also written to debug log (in addition to existing `debug_print()`); add debug_log_operation for template resolution status with caller.
 - [x] 4.1.5 Run `hatch run format` and `hatch run type-check`
-- [ ] 4.1.6 Apply the **debug log standard** consistently to remaining command modules and adapters: analyze, contract_cmd, drift, enforce, generate, import_cmd, migrate, plan, project_cmd, repro, sdd, spec, sync, update, validate. For each: log started/prepared → attempt (if multi-step) → success or failed with reason/error; include all context needed for anomaly analysis and bug reports (operation, target, status, error, extra: payload/response/reason sanitized). File ops: prepared → finished/failed. API ops: attempt → success/failed with payload, response, reason. No single-line INFO-style entries; every significant operation must have full context (see design “Debug log standard” and auth azure-devops reference).
+- [x] 4.1.6 Apply the **debug log standard** consistently to remaining command modules and adapters: analyze, contract_cmd, drift, enforce, generate, import_cmd, migrate, plan, project_cmd, repro, sdd, spec, sync, update, validate. For each: log started/prepared → attempt (if multi-step) → success or failed with reason/error; include all context needed for anomaly analysis and bug reports (operation, target, status, error, extra: payload/response/reason sanitized). File ops: prepared → finished/failed. API ops: attempt → success/failed with payload, response, reason. No single-line INFO-style entries; every significant operation must have full context (see design “Debug log standard” and auth azure-devops reference).
 
 ## 5. Tests and quality
 
@@ -46,4 +46,4 @@
 - [x] 6.1.2 Update versions and increase patch version. Sync versions across `pyproject.toml`, `setup.py`, `src/__init__.py`, and `src/specfact_cli/__init__.py`.
 - [x] 6.1.3 Update CHANGELOG.md with new behavior and use the new patch version from 6.1.2.
 - [x] 6.1.4 Add `docs/reference/debug-logging.md` (user and developer reference); link from `docs/reference/commands.md`, `docs/reference/README.md`, `docs/reference/directory-structure.md`, `docs/guides/troubleshooting.md`, and `README.md`.
-- [ ] 6.1.5 Push branch and create Pull Request: `git push -u origin feature/add-debug-logs-specfact-home` then `gh pr create --base dev --title "feat: add debug logs under ~/.specfact/logs" --body "Closes #158. OpenSpec change: add-debug-logs-specfact-home."` (or use GitHub web UI).
+- [x] 6.1.5 Push branch and create Pull Request: `git push -u origin feature/add-debug-logs-specfact-home` then `gh pr create --base dev --title "feat: add debug logs under ~/.specfact/logs" --body "Closes #158. OpenSpec change: add-debug-logs-specfact-home."` (or use GitHub web UI).
diff --git a/openspec/specs/debug-logging/spec.md b/openspec/specs/debug-logging/spec.md
new file mode 100644
index 0000000..66bacf2
--- /dev/null
+++ b/openspec/specs/debug-logging/spec.md
@@ -0,0 +1,131 @@
+# debug-logging Specification
+
+## Purpose
+TBD - created by archiving change add-debug-logs-specfact-home. Update Purpose after archive.
+## Requirements
+### Requirement: User-level debug log directory
+
+The system SHALL provide a user-level directory for debug logs when debug mode is enabled.
+
+#### Scenario: Resolve ~/.specfact/logs
+
+- **GIVEN** debug mode may be enabled
+- **WHEN** `get_specfact_home_logs_dir()` is called
+- **THEN** returns path equivalent to `os.path.expanduser("~/.specfact/logs")`
+- **AND** creates the directory with `os.makedirs(..., mode=0o755, exist_ok=True)` on first use
+
+#### Scenario: No directory when debug is off
+
+- **GIVEN** debug mode is disabled
+- **WHEN** no debug log has been written in this run
+- **THEN** `~/.specfact/logs` is not required to exist
+- **AND** `get_specfact_home_logs_dir()` may still return the path for callers that need it
+
+### Requirement: Debug output routing
+
+The system SHALL route debug output to both console and a debug log file when debug mode is enabled.
+
+#### Scenario: debug_print writes to console and file when debug on
+
+- **GIVEN** debug mode is enabled and debug log file is initialized
+- **WHEN** `debug_print(...)` is called
+- **THEN** output is written to the configured Rich console (current behavior)
+- **AND** the same content is appended to the debug log file under `~/.specfact/logs`
+
+#### Scenario: debug_print console-only when debug off
+
+- **GIVEN** debug mode is disabled
+- **WHEN** `debug_print(...)` is called
+- **THEN** no output is produced (current behavior)
+- **AND** no debug log file is written
+
+### Requirement: Structured operation metadata
+
+The system SHALL support logging structured operation metadata when debug mode is enabled.
+
+#### Scenario: debug_log_operation no-op when debug off
+
+- **GIVEN** debug mode is disabled
+- **WHEN** `debug_log_operation(operation=..., target=..., status=..., error=...)` is called
+- **THEN** no log file write occurs
+- **AND** no console output is produced
+
+#### Scenario: debug_log_operation writes metadata when debug on
+
+- **GIVEN** debug mode is enabled and debug log file is initialized
+- **WHEN** `debug_log_operation(operation="api_request", target=url_redacted, status=200, error=None)` is called
+- **THEN** a structured log line (or block) is written to the debug log file
+- **AND** the line includes operation, target, status, and optionally error and extra fields
+- **AND** sensitive values in target or extra are redacted (e.g. via LoggerSetup.redact_secrets)
+
+#### Scenario: Adapters log API metadata when debug on
+
+- **GIVEN** debug mode is enabled
+- **WHEN** an adapter performs an API request (e.g. ADO WIQL, Work Items PATCH, GitHub REST)
+- **THEN** the adapter logs operation metadata (operation type, URL redacted, method, status code)
+- **AND** on failure, logs error snippet or response body (redacted)
+- **AND** does not log full request/response bodies that may contain secrets
+
+### Requirement: Debug log standard (consistent pattern for anomaly analysis and bug reports)
+
+The system SHALL apply a consistent debug log pattern for every significant operation when debug mode is enabled, so that logs support anomaly analysis, unexpected error/failure diagnosis, reporting, and bug reports (production-tool quality).
+
+#### Scenario: Every significant operation has started, progress, and outcome
+
+- **GIVEN** debug mode is enabled
+- **WHEN** a significant operation is performed (auth flow, file I/O, API call, template resolution, or any operation that can fail or affect behavior)
+- **THEN** the implementation logs at least: **started/prepared** (once at begin), **attempt** (for each distinct step if multi-step), and **outcome** (exactly once: success with reason/method/cache or failed with error and reason)
+- **AND** no operation is represented by only a single INFO-style line without outcome and reason
+- **AND** structured lines include operation, target (redacted), status, and when applicable error, extra (payload/response/reason sanitized), caller
+
+#### Scenario: Reference implementation
+
+- **GIVEN** the auth azure-devops flow
+- **WHEN** debug mode is enabled and the user runs the OAuth flow
+- **THEN** the debug log contains: started → cache_prepared → attempt (interactive_browser) → success or fallback (with reason) → attempt (device_code) → success or failed (with error/reason) → success (token_stored with method/cache)
+- **AND** a reader can determine from the log alone whether the flow succeeded or failed and why
+
+### Requirement: Debug log context (timestamp, caller, file/API details)
+
+The system SHALL include context in every debug log line when debug mode is enabled.
+
+#### Scenario: Timestamp on every line
+
+- **GIVEN** debug mode is enabled and debug log file is initialized
+- **WHEN** any line is written to the debug log file (via debug_print or debug_log_operation)
+- **THEN** the line is prefixed with a timestamp (e.g. `%(asctime)s | %(message)s` with datefmt `%Y-%m-%d %H:%M:%S`)
+
+#### Scenario: Caller (module/method) in structured lines
+
+- **GIVEN** debug mode is enabled
+- **WHEN** `debug_log_operation(..., caller=...)` is called with a caller string (e.g. `module:function`)
+- **THEN** the structured log line includes the caller in the payload
+- **AND** call sites may infer caller via inspect or pass explicitly
+
+#### Scenario: File operations log prepared / finished / failed
+
+- **GIVEN** debug mode is enabled
+- **WHEN** a command or adapter performs file IO (read/write)
+- **THEN** it logs operation metadata with status prepared/started before the operation
+- **AND** logs again with status finished or failed and error/reason when applicable
+- **AND** target is the path (redacted if sensitive); extra may include size, mime, etc.
+
+#### Scenario: API operations log operation, URL, payload (sanitized), response, status, error, reason
+
+- **GIVEN** debug mode is enabled
+- **WHEN** an adapter performs an API request
+- **THEN** it logs operation metadata with operation type, target (URL redacted), status (HTTP or success/failure)
+- **AND** extra includes payload (sanitized via LoggerSetup.redact_secrets), response (sanitized), and reason when applicable
+- **AND** on failure, error and reason are included
+
+### Requirement: Backward compatibility
+
+The system SHALL preserve existing behavior when debug mode is disabled.
+
+#### Scenario: get_runtime_logs_dir unchanged
+
+- **GIVEN** any mode
+- **WHEN** `get_runtime_logs_dir()` is called
+- **THEN** returns the same path as before (repo-relative logs or /app/logs in Docker)
+- **AND** behavior of LoggerSetup and existing loggers is unchanged
+