Refactor documentation and analysis in final master plan, opus47 analysis, and opus47 review of GPT-5.5

- Updated the final master plan to improve clarity and consistency in the status of various capabilities, including fixes and enhancements made as of 2026-05-12.
- Revised the opus47 analysis to provide a more structured overview of the system's production readiness, including detailed coverage of OWASP Top 10 risks and operational gaps.
- Enhanced the opus47 review of GPT-5.5 by clarifying severity ratings and rationales for various items, while adding new high-severity items that were previously overlooked.

docs/TEST-PLAN-v1.3-to-HEAD.md

@@ -12,7 +12,7 @@ Organized by sprint area with pre-requisites, test steps, and pass/fail criteria
 | **Sprint 2** (Reliability)    | 2.1/2.2/2.3/2.5         | Partial  | §2.2/§2.3 validated locally 2026-05-10; §2.1/§2.5 need real VMs           |
 | **Sprint 3** (Observability)  | 4.1/4.3/4.4             | Partial  | §4.3/§4.4 validated locally 2026-05-10; §4.1 (JSONL) needs real build job |
 | **Sprint 4-6** (Quality/Perf) | 1.4/3.1/3.6/5.2/5.3/5.4 | Partial  | §1.4/§5.2/§5.3/§5.4 validated 2026-05-10; §3.1/§3.6 need real VMs         |
-| **Sprint 7** (Testing)        | 5.1                     | [x] Done | 22/22 Pester tests passing in 12.9s (re-validated 2026-05-11)              |
+| **Sprint 7** (Testing)        | 5.1                     | [x] Done | 22/22 Pester tests passing in 12.9s (re-validated 2026-05-11)             |
 | **§1.6** (Docs)               | Threat model            | [x] Done | BEST-PRACTICES.md verified 2026-05-10                                     |
 | **§3.2** (Perf)               | 7-Zip compression       | Partial  | Fallback path validated; in-VM 7-Zip speed test needs real VM             |
 | **§5.4** (PSScriptAnalyzer)   | 0 errors, 298 warnings  | [x] Done | All 6 actionable warnings fixed 2026-05-11; 0 Error severity violations   |