Harden release path, CI gates, and Networking repair

[Chookees]

Summary

• Fix NuGet versioning so release packs are clean 1.0.0 (local packs keep -local); add Publish NuGet workflow.
• Pin SDK to 10.0.302; add lockfiles, Dependabot, CODE_OF_CONDUCT, and issue templates.
• CI: Ubuntu+Windows matrix, build samples, locked restore, >=85% line coverage gate, hard dependency-review.
• Networking: adaptive chunk sizing and corrupt-chunk/digest repair; docs honesty pass (SECURITY, STATE, FINAL_REPORT, CHANGELOG).
• Extra Distributed/Integrity tests; 242 tests passing; line coverage ~85.8%.

Test plan

• CI green on Ubuntu and Windows
• Confirm packed artifacts are FunctionFoundry.*.1.0.0.nupkg (no -local) from CI pack step
• After merge: add NUGET_API_KEY, run Publish NuGet for 1.0.0, unlist 1.0.0-local
• Spot-check Networking adaptive/repair tests and samples build