📝 Add AGENTS.md and update NuGet publish workflow

AGENTS.md

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+# AGENTS.md — FSharp.Control.TaskSeq
+
+## Project Overview
+
+FSharp.Control.TaskSeq is an F# library providing a `taskSeq` computation expression for `IAsyncEnumerable<'T>`, along with a comprehensive `TaskSeq` module of combinators. It targets `netstandard2.1`.
+
+## Repository Layout
+
+- `src/FSharp.Control.TaskSeq/` — Main library (netstandard2.1)
+- `src/FSharp.Control.TaskSeq.Test/` — xUnit test project (net6.0)
+- `src/FSharp.Control.TaskSeq.SmokeTests/` — Smoke/integration tests
+- `src/FSharp.Control.TaskSeq.sln` — Solution file
+- `Version.props` — Single source of truth for the package version
+- `build.cmd` — Windows build/test script used by CI
+
+## Build
+
+The solution uses the .NET SDK. Restore tools first, then build:
+
+```bash
+dotnet tool restore
+dotnet build src/FSharp.Control.TaskSeq.sln -c Release
+```
+
+Or use the provided script (Windows):
+
+```cmd
+./build.cmd            # default: release build
+./build.cmd debug      # debug build
+```
+
+`build.cmd` modes: `build` (default), `test`, `ci`. Configurations: `release` (default), `debug`.
+
+## Test
+
+Tests use **xUnit** with `FsUnit.xUnit` assertions. The test project is at `src/FSharp.Control.TaskSeq.Test/FSharp.Control.TaskSeq.Test.fsproj`.
+
+Run tests locally:
+
+```bash
+dotnet test src/FSharp.Control.TaskSeq.Test/FSharp.Control.TaskSeq.Test.fsproj -c Release
+```
+
+Or via the build script:
+
+```cmd
+./build.cmd test              # runs tests without TRX logging
+./build.cmd test -debug       # debug configuration
+./build.cmd ci                # CI mode: adds --blame-hang-timeout 60000ms and TRX logging
+./build.cmd ci -release       # CI mode, release config
+./build.cmd ci -debug         # CI mode, debug config
+```
+
+CI runs both debug and release test configurations on `windows-latest`. Test results are output as TRX files to `src/FSharp.Control.TaskSeq.Test/TestResults/`.
+
+## Code Formatting
+
+Formatting is enforced by **Fantomas** (version 6.3.0-alpha-004, configured as a dotnet local tool).
+
+Check formatting (CI runs this on every PR):
+
+```bash
+dotnet tool restore
+dotnet fantomas . --check
+```
+
+Apply formatting:
+
+```bash
+dotnet fantomas .
+```
+
+Fantomas settings are in `src/.editorconfig` under the `[*.{fs,fsx}]` section. Key settings:
+
+- `max_line_length = 140`
+- `indent_size = 4`
+- `fsharp_space_before_parameter = true`
+- `fsharp_space_before_lowercase_invocation = true`
+- `fsharp_max_if_then_else_short_width = 60`
+- `fsharp_max_record_width = 80`
+- `fsharp_max_array_or_list_width = 100`
+
+## CI Workflows
+
+All workflows are in `.github/workflows/`:
+
+| Workflow | File | Trigger | Purpose |
+|---|---|---|---|
+| **ci-build** | `build.yaml` | Pull requests | Verify formatting (`dotnet fantomas . --check`) then build release on Windows |
+| **ci-test** | `test.yaml` | Pull requests | Run tests in both debug and release on Windows, upload TRX artifacts |
+| **ci-report** | `test-report.yaml` | After `ci-test` completes | Publish test results via `dorny/test-reporter` |
+| **Build main** | `main.yaml` | Push to `main` | Build + test release on Windows |
+| **Publish** | `publish.yaml` | Push to `main` | Build, then push NuGet package (skip-duplicate) |
+
+## Conventions
+
+- F# source files use `.fs` extension; signature files use `.fsi`.
+- `TreatWarningsAsErrors` is enabled for all projects.
+- File ordering matters in F# — the `<Compile>` order in `.fsproj` files defines compilation order.
+- The library targets `netstandard2.1`; tests target `net6.0` with `FSharp.Core` pinned to `6.0.1`.
+- NuGet packages are output to the `packages/` directory.