@chore(release): bump version to 3.9.0 (issue #112)

- deploy.yml: VERSION 3.8.0 -> 3.9.0 (docker image tag for next push to main)
- NavMenu.razor: visible version v3.8.0 -> v3.9.0
- CampaignTemplatesNavigationTests.NavMenu_ShouldExposeCurrentProjectVersion: expected v3.7.1 -> v3.9.0 (was broken since 3.8.0 bump in commit 71080ae)
- RELEASE_NOTES.md: prepend Minor 3.9.0 entry (Discord wizard, issue #112) with full file inventory
- docs/review-brief.md: code-review spec for the verifier session

Build green (0 warnings, 0 errors), dotnet format clean.

docs/review-brief.md

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+"""Detailed code review plan for the Discord wizard feature branch.
+
+Read this file FIRST. It has the full review scope. The original prompt
+in the spawn was truncated due to Windows CLI limits; this file is the
+canonical spec.
+"""
+
+# Branch to review
+BRANCH = "feat/issue-112-wizard-refactor"
+BASE = "origin/main"
+
+# Files of interest
+SHARED = "src/GmRelay.Shared/Features/Sessions/CreateSession/Wizard/*"
+BOT_WIZARD = "src/GmRelay.Bot/Features/Sessions/CreateSession/Wizard/*"
+BOT_CREATE = "src/GmRelay.Bot/Features/Sessions/CreateSession/*"
+MIGRATION = "src/GmRelay.Bot/Migrations/V032__add_wizard_drafts_platform.sql"
+DISCORD = "src/GmRelay.DiscordBot/Features/Sessions/Wizard/*"
+PROG_CS = "src/GmRelay.DiscordBot/Program.cs"
+TESTS_WIZ = "tests/GmRelay.Bot.Tests/Features/Sessions/CreateSession/Wizard/*"
+TESTS_SMOKE = "tests/GmRelay.Bot.Tests/Discord/DiscordWizardInteractionModuleSourceTests.cs"
+DELIVERABLE = "deliverable.md"
+
+REVIEW_FOCUS = [
+    "Architecture: Shared/Bot/DiscordBot separation; no Telegram.Bot in Shared; no NetCord in Shared; single state machine source.",
+    "Security: owner/co-GM checks everywhere; NRE on null Context.User; SQL injection; connection strings with passwords.",
+    "Correctness: AOT-safety (no reflection, no dynamic); off-by-one in customId parsers; CancellationToken/Services.",
+    "Style: naming consistent; Async/await by convention; logging at right levels.",
+    "Tests: smoke tests are string-matching — where would real tests be useful?",
+    "Migration safety: V032 DEFAULT value, will it fail on existing rows?",
+    "Documentation: deliverable.md updated, open questions listed?",
+]
+
+OUTPUT_FORMAT = """\
+## VERDICT: APPROVE / REQUEST_CHANGES / COMMENT
+
+## Critical findings
+(file:line — what's wrong — how to fix)
+
+## Important findings
+(file:line — what's wrong)
+
+## Nits
+(quick observations)
+
+## Summary
+(1-2 sentences)
+"""
+
+COMMANDS_HINT = """\
+git fetch origin
+git diff origin/main..feat/issue-112-wizard-refactor --stat
+git diff origin/main..feat/issue-112-wizard-refactor
+dotnet build && dotnet test
+"""