update to latest packages - #419

- Capture seven Phase 0 baseline evidence artifacts in the 2026-08-04T21-04
  series. The committed 14-36 set was invalid twice over: captured on a host
  lacking the VSTO runtime assemblies, and against a pre-package-update
  dependency graph. The new baseline records the analyzer and nullable builds
  each returning EXIT_CODE 0, zero CS0234/MSB3245, MSB3277 count 0, nine test
  assemblies with 6112/6112 passing, and repo coverage 85.3550% line /
  78.5353% branch. The 14-36 artifacts are retained for audit.
- Revise the plan in place from v0.3 to v0.6 across three revision passes.
  Design Decision 10 records that the System.Runtime.CompilerServices.Unsafe
  pin divergence which halted execution at P1-T6 was resolved upstream by the
  rebase onto ce0c91e, not by a plan task, so no P1-T6a was added. Design
  Decision 11 makes nullable annotations mandatory on the new SvgRenderer
  surface, because the file is #nullable enable and net48 has no NotNullWhen.
  Split P2-T8's coverage gate into a newly-added >= 90% set and a changed-member
  no-regression set to match AC-5 rather than exceed it, with a named exception
  for the CLR-invoked ResolveByNameAndKey. Retarget every Phase 0 baseline
  reference to the new series and correct stale version literals.
- Revert AC-6 to the absolute single-clean-pass form; the relative amendment was
  specific to the host without the VSTO runtime. Amend AC-9 and AC-10 to record
  the package versions superseded by PR #419.
- Record four agent-memory findings: incremental builds yielding a vacuous
  nullable baseline, coverage gates on CLR-invoked private members, the nullable
  context mismatch between production and test projects, and the planner tool
  surface excluding the MCP validator.

No production or test C# is modified; SVGControl/SvgRenderer.cs is untouched.
Preflight returns ALL CLEAR against v0.6; execution resumes at P1-T6.

Refs: #418

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>