diff --git a/scratchpad/dev.md b/scratchpad/dev.md
index 4867bef9741..8a5d4255ece 100644
--- a/scratchpad/dev.md
+++ b/scratchpad/dev.md
@@ -1,7 +1,7 @@
 # Developer Instructions
 
-**Version**: 4.8
-**Last Updated**: 2026-03-31
+**Version**: 4.9
+**Last Updated**: 2026-04-01
 **Purpose**: Consolidated development guidelines for GitHub Agentic Workflows
 
 This document consolidates specifications from the scratchpad directory into unified developer instructions. It provides architecture patterns, security guidelines, code organization rules, and testing practices.
@@ -2635,6 +2635,26 @@ These files are loaded automatically by compatible AI tools (e.g., GitHub Copilo
 - [jsonschema-go Module Summary](./mods/jsonschema-go.md) - Usage patterns for `github.com/google/jsonschema-go` v0.3.0: `ForType()`, `GenerateOutputSchema[T]()` generic helper, struct tag integration, and MCP tool schema generation
 - [CLI Breaking Changes](./breaking-cli-rules.md) - Categories of breaking vs. non-breaking CLI changes; decision tree, changeset format, review checklist, exit code and JSON output standards
 - [Workflow Refactoring Patterns](./workflow-refactoring-patterns.md) - Patterns for extracting large workflows into shared modules: size guidelines (target 400–500 lines), extraction checklist, shared module structure templates, and anti-patterns
+- [Error Handling Reference](./errors.md) - Structured error types, retry logic, validation helpers, and error wrapping patterns across Go and JavaScript
+- [File Inlining and Runtime Imports](./file-inlining.md) - `{{#runtime-import}}` macro: file/URL content inclusion in workflow prompts, line range support, and security guardrails
+- [Safe Output Environment Variables](./safe-output-environment-variables.md) - Reference for environment variables available to safe output job types: common variables, job-specific configs, activation job variables, and troubleshooting
+- [Schema Validation](./schema-validation.md) - JSON schema validation with `additionalProperties: false`: strict frontmatter and MCP config validation to catch typos
+- [gosec Exclusions Reference](./gosec.md) - Documented gosec security rule exclusions in `.golangci.yml` with CWE mappings, per-rule rationale, and suppression guidelines
+- [MCP Logs Guardrail](./mcp_logs_guardrails.md) - Automatic token-limit guardrail for the MCP `logs` command: trigger threshold (12000 tokens), jq filter suggestions, schema responses
+- [End-to-End Feature Testing](./end-to-end-feature-testing.md) - Procedure for testing new features via agentic workflows in pull requests: Dev workflow modification, triggering, monitoring, and iteration
+- [Visual Regression Testing](./visual-regression-testing.md) - Golden-file visual regression testing for terminal output: running tests, updating golden files, CI integration
+- [Compiled Workflow Layout Reference](./layout.md) - Auto-generated catalog of all file paths, artifact names, and patterns in compiled `.lock.yml` workflows
+- [Error Recovery Patterns](./error-recovery-patterns.md) - Error handling patterns, retry mechanisms, circuit breakers, panic recovery, and debugging runbook for agent workflows
+- [PR Checkout Logic](./pr-checkout-logic-explained.md) - `pull_request` vs `pull_request_target` event differences, fork PR detection signals, checkout decision logic, and security model
+- [Styles Guide](./styles-guide.md) - Terminal color and style definitions: adaptive palette for light/dark modes, pre-configured styles for tables, messages, and lists
+- [Firewall Log Parsing](./firewall-log-parsing.md) - Go firewall log parser implementation: 10-field log format, validation rules, request classification, integration with `logs`/`audit` commands
+- [Agent Container Testing](./agent-container-testing.md) - Smoke test workflow for validating pre-installed tools in agent container environment (bash, git, jq, curl, gh, node, python3, go, java, dotnet)
+- [Ubuntu Runner Environment](./ubuntulatest.md) - Pre-installed tools reference for `ubuntu-latest` (Ubuntu 24.04) runner: language runtimes, container tools, databases, and CI/CD tooling
+- [Artifact Naming Compatibility](./artifact-naming-compatibility.md) - Backward/forward compatibility for artifact naming in `gh aw logs` and `gh aw audit`: naming schemes, flattening process, compatibility matrix
+- [Debugging Action Pinning](./debugging-action-pinning.md) - Root cause and debugging steps for action pinning version comment flipping between equivalent tags (e.g., `v8` vs `v8.0.0`)
+- [Security Review (Template Injection)](./security_review.md) - Security review of zizmor template injection findings: both findings are false positives; includes analysis of undefined environment variable edge case
+- [Engine Architecture Review](./engine-architecture-review.md) - Deep review of ISP engine interface design, all engine implementations (Copilot, Claude, Codex, Custom), test coverage, and extensibility assessment
+- [Engine Review Summary](./engine-review-summary.md) - Summary findings from engine architecture review: interface design, security, testing, documentation status, and conclusion
 
 ### External References
 
@@ -2646,6 +2666,7 @@ These files are loaded automatically by compatible AI tools (e.g., GitHub Copilo
 ---
 
 **Document History**:
+- v4.9 (2026-04-01): Maintenance tone scan — fixed 5 tone issues across 4 spec files: `engine-architecture-review.md` (removed "well-implemented", replaced 5-star ratings with factual assessment), `engine-review-summary.md` (removed "production-ready", replaced rating section with factual conclusion), `mcp_logs_guardrails.md` (2 fixes: "helpful guidance"→"jq filter suggestions and schema", "Keeps output manageable"→"Limits response size"), `visual-regression-testing.md` (removed "negatively impact the user experience"). Added 21 new Related Documentation links for previously uncovered spec files. Coverage: 62 spec files.
 - v4.8 (2026-03-31): Added CLI Breaking Changes subsection to Release Management (from `breaking-cli-rules.md`: breaking vs. non-breaking categories, decision tree, changeset format, review checklist, JSON output standards). Added Workflow Size and Refactoring subsection to Workflow Patterns (from `workflow-refactoring-patterns.md`: size guidelines, module extraction via `imports:`, refactoring checklist, anti-patterns). Added 2 new Related Documentation links. Coverage: 68 spec files (2 new).
 - v4.7 (2026-03-30): Added 4 previously uncovered subdirectory spec files (`agents/hierarchical-agents.md`, `agents/hierarchical-agents-quickstart.md`, `mods/README.md`, `mods/jsonschema-go.md`). Fixed 3 tone issues in `mods/jsonschema-go.md`: "Active maintenance and community support" → "MIT licensed; maintained by Google" (line 13), "Developer-Friendly API" heading → "API Design" (line 111), "Good integration with Go idioms" removed and "Concise function signatures" → "Function signatures follow Go idioms" (lines 112–113). Coverage: 66 spec files (4 new).
 - v4.6 (2026-03-29): Maintenance tone scan — 0 new issues across 62 spec files. No new spec files since v4.5 (latest commit `96873d8` touched `.changeset/` only). Coverage: 62 spec files.
diff --git a/scratchpad/engine-architecture-review.md b/scratchpad/engine-architecture-review.md
index 758143a8704..254ed1cf277 100644
--- a/scratchpad/engine-architecture-review.md
+++ b/scratchpad/engine-architecture-review.md
@@ -11,7 +11,7 @@ The agentic engine architecture follows the Interface Segregation Principle (ISP
 ### Key Findings
 
 ✅ **Strengths**:
-- Interface segregation is well-implemented
+- Interface segregation follows ISP with 7 focused interfaces composed into one composite interface
 - BaseEngine provides sensible defaults
 - All engines implement required interfaces correctly
 - Clear separation between engine-specific and shared code
@@ -311,13 +311,13 @@ The agentic engine architecture follows ISP, implements security at multiple lay
 
 The `adding-new-engines.md` document provides step-by-step guidance for implementing new engines. The architecture requires no structural changes and supports additional integrations.
 
-### Overall Rating
+### Assessment
 
-**Architecture**: ⭐⭐⭐⭐⭐ (5/5)  
-**Implementation**: ⭐⭐⭐⭐⭐ (5/5)  
-**Testing**: ⭐⭐⭐⭐⭐ (5/5)  
-**Documentation**: ⭐⭐⭐⭐⭐ (5/5) - After improvements  
-**Extensibility**: ⭐⭐⭐⭐⭐ (5/5) - After improvements
+**Architecture**: Follows ISP with 7 focused interfaces; no structural changes required  
+**Implementation**: All engines pass interface compliance tests  
+**Testing**: Automated compliance validation covers all engine types  
+**Documentation**: `adding-new-engines.md` provides complete implementation guide  
+**Extensibility**: New engines added by embedding `BaseEngine` and overriding targeted methods
 
 ### Key Deliverables
 
diff --git a/scratchpad/engine-review-summary.md b/scratchpad/engine-review-summary.md
index 23cf908949b..bed7dfdab31 100644
--- a/scratchpad/engine-review-summary.md
+++ b/scratchpad/engine-review-summary.md
@@ -273,7 +273,7 @@ All implementations follow established patterns and are thoroughly tested.
 
 ## Conclusion
 
-The agentic engine architecture is **production-ready**. It follows SOLID principles, has comprehensive test coverage, and provides clear extensibility patterns through:
+The agentic engine architecture follows SOLID principles, has comprehensive test coverage, and provides extensibility patterns through:
 
 1. **Interface Segregation**: Focused interfaces composed together
 2. **BaseEngine Defaults**: Sensible defaults for all methods
@@ -290,9 +290,9 @@ The architecture **requires no structural changes**. The only gap was comprehens
 - Best practices
 - Troubleshooting guide
 
-### Overall Rating: ⭐⭐⭐⭐⭐ (5/5)
+### Conclusion
 
-The agentic engine architecture is ready to support new engine integrations with clear guidance and established patterns.
+The agentic engine architecture supports new engine integrations through established patterns and the `adding-new-engines.md` implementation guide.
 
 ## Files Changed
 
diff --git a/scratchpad/mcp_logs_guardrails.md b/scratchpad/mcp_logs_guardrails.md
index 51a3e154502..1d9502538ff 100644
--- a/scratchpad/mcp_logs_guardrails.md
+++ b/scratchpad/mcp_logs_guardrails.md
@@ -20,7 +20,7 @@ The MCP server `logs` command now includes an automatic guardrail that:
 
 1. **Checks output size** before returning results
 2. **Triggers at 12000 tokens** (default, configurable)
-3. **Returns helpful guidance** instead of large payloads
+3. **Returns jq filter suggestions and schema** instead of large payloads
 
 ## How It Works
 
@@ -222,7 +222,7 @@ make test-unit
 
 ## Benefits
 
-1. **Prevents overwhelming responses** - Keeps output manageable for AI models
+1. **Limits response size** - Prevents context overflow in AI model responses
 2. **Provides guidance** - Suggests specific filters to get the data you need
 3. **Self-documenting** - Returns the schema so you know what fields are available
 4. **Preserves functionality** - jq filtering works the same as before
diff --git a/scratchpad/visual-regression-testing.md b/scratchpad/visual-regression-testing.md
index 4cdece21a41..0379860f185 100644
--- a/scratchpad/visual-regression-testing.md
+++ b/scratchpad/visual-regression-testing.md
@@ -2,7 +2,7 @@
 
 ## Overview
 
-Visual regression testing ensures that console output formatting remains consistent across code changes. This prevents unintentional changes to table layouts, box rendering, tree structures, and error formatting that could negatively impact the user experience.
+Visual regression testing detects regressions in terminal output rendering by comparing actual output against golden files. It catches unintended changes to table layouts, box rendering, tree structures, and error formatting.
 
 ## Implementation