chore: add pre-push preflight + setup-hooks
Four-block pre-push gate matching the HellionChat pattern: - Block A (verify-version-consistency.sh): csproj <Version> vs repo.json AssemblyVersion / TestingAssemblyVersion / DownloadLink* tag presence. Tolerant of repo.json being absent so v0.1.0 (which has no public release manifest yet) does not fail at push time; the missing-file path turns into the full cross-check once repo.json lands. - Block B: dotnet build Anvil.sln -p:Platform=x64 -c Release. Platform pin is forge-wide (Forgeimizer v0.1.0 lesson: solution build defaults drift to AnyCPU otherwise). - Block C: dotnet csharpier check ./Anvil. Catches the accumulated formatter drift that hit HellionChat v1.5.6 (12 files) when only build was checked per task. - Block D: markdownlint-cli2 over the repo's *.md files (excludes node_modules, bin, obj, .claude, CLAUDE.md). Plus setup-hooks.sh as the one-shot installer that points core.hooksPath at .githooks/ and chmods the scripts. README.md: MD040 fix for the custom-repo URL fence (added text language tag).
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