Improve Bluesky reply/quote accessibility and split test bootstrap workflow

- Fix Bluesky quoted post rendering across list output, screen-reader speech, and View Post by centralizing quote extraction.
- Add robust quote URL extraction (facets/embed/text), include quoted URLs in URL shortcuts, and append full quoted URLs when hidden/truncated.
- Improve reply context handling:
  - add and use `$reply_to` template variable,
  - hydrate missing reply target handles in home/feed items,
  - keep backward compatibility for templates that do not include `$reply_to`.
- Align Bluesky default/fallback post templates to include reply context (`$reply_to`).
- Add/extend focused Bluesky tests for quote text, quote URLs, reply context, and template fallback behavior.
- Refactor scripts:
  - add bootstrap-dev.ps1 for environment setup (submodules, venv, deps),
  - keep run-tests.ps1 focused on running tests only,
  - add PowerShell comment-based help in English.
- Update README with the new bootstrap/test workflow and examples.

scripts/bootstrap-dev.ps1

@@ -0,0 +1,176 @@
+<#
+.SYNOPSIS
+Bootstraps a local TWBlue development environment on Windows.
+
+.DESCRIPTION
+This script initializes git submodules, creates/uses a virtual environment,
+and installs Python dependencies from requirements.txt.
+It is intended to be run once when starting on the repository (or whenever
+you need to rebuild your local environment).
+
+.PARAMETER RecreateVenv
+Deletes and recreates the `.venv` folder before installing dependencies.
+
+.PARAMETER UpgradePip
+Upgrades `pip`, `setuptools`, and `wheel` before installing requirements.
+
+.PARAMETER SkipSubmodules
+Skips `git submodule init` and `git submodule update --recursive`.
+
+.PARAMETER SystemPython
+Uses a detected system Python instead of creating/using `.venv`.
+
+.EXAMPLE
+./scripts/bootstrap-dev.ps1
+
+.EXAMPLE
+./scripts/bootstrap-dev.ps1 -RecreateVenv -UpgradePip
+
+.EXAMPLE
+./scripts/bootstrap-dev.ps1 -SystemPython -SkipSubmodules
+#>
+
+param(
+    [switch]$RecreateVenv,
+    [switch]$UpgradePip,
+    [switch]$SkipSubmodules,
+    [switch]$SystemPython
+)
+
+$ErrorActionPreference = "Stop"
+
+function Write-Step {
+    param([string]$Message)
+    Write-Host "==> $Message" -ForegroundColor Cyan
+}
+
+function Resolve-RepoRoot {
+    param([string]$ScriptDir)
+    return (Resolve-Path (Join-Path $ScriptDir "..")).Path
+}
+
+function Test-PythonCandidate {
+    param(
+        [string]$Exe,
+        [string[]]$BaseArgs = @()
+    )
+
+    try {
+        & $Exe @BaseArgs -c "import sys; print(sys.version)" | Out-Null
+        return ($LASTEXITCODE -eq 0)
+    }
+    catch {
+        return $false
+    }
+}
+
+function New-PythonSpec {
+    param(
+        [string]$Exe,
+        [string[]]$BaseArgs = @()
+    )
+
+    return [pscustomobject]@{
+        Exe = $Exe
+        BaseArgs = $BaseArgs
+    }
+}
+
+function Get-PythonSpec {
+    param([string]$RepoRoot, [bool]$UseSystemPython)
+
+    if (-not $UseSystemPython) {
+        $venvPython = Join-Path $RepoRoot ".venv\Scripts\python.exe"
+        if (Test-Path $venvPython) {
+            return (New-PythonSpec -Exe $venvPython)
+        }
+    }
+
+    $candidates = @()
+
+    $pythonCmd = Get-Command python -ErrorAction SilentlyContinue
+    if ($pythonCmd) {
+        $candidates += ,(New-PythonSpec -Exe "python")
+    }
+
+    $pyCmd = Get-Command py -ErrorAction SilentlyContinue
+    if ($pyCmd) {
+        $candidates += ,(New-PythonSpec -Exe "py" -BaseArgs @("-3.10"))
+        $candidates += ,(New-PythonSpec -Exe "py" -BaseArgs @("-3"))
+    }
+
+    foreach ($candidate in $candidates) {
+        if (Test-PythonCandidate -Exe $candidate.Exe -BaseArgs $candidate.BaseArgs) {
+            return $candidate
+        }
+    }
+
+    throw "Could not find a usable Python. Install Python 3.10+ and try again."
+}
+
+function Invoke-Python {
+    param(
+        [pscustomobject]$PythonSpec,
+        [string[]]$Arguments,
+        [string]$WorkingDirectory
+    )
+
+    Push-Location $WorkingDirectory
+    try {
+        & $PythonSpec.Exe @($PythonSpec.BaseArgs + $Arguments)
+        if ($LASTEXITCODE -ne 0) {
+            throw "Python command failed with exit code $LASTEXITCODE"
+        }
+    }
+    finally {
+        Pop-Location
+    }
+}
+
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$repoRoot = Resolve-RepoRoot -ScriptDir $scriptDir
+
+Write-Step "Repository: $repoRoot"
+
+if (-not $SkipSubmodules) {
+    $gitCmd = Get-Command git -ErrorAction SilentlyContinue
+    if ($gitCmd) {
+        Write-Step "Initializing/updating submodules"
+        Push-Location $repoRoot
+        try {
+            & git submodule init | Out-Host
+            & git submodule update --recursive | Out-Host
+        }
+        finally {
+            Pop-Location
+        }
+    }
+    else {
+        Write-Warning "Git is not available. Skipping submodule initialization."
+    }
+}
+
+$venvPath = Join-Path $repoRoot ".venv"
+if ($RecreateVenv -and (Test-Path $venvPath)) {
+    Write-Step "Removing existing virtual environment"
+    Remove-Item -Recurse -Force $venvPath
+}
+
+if (-not $SystemPython -and -not (Test-Path (Join-Path $venvPath "Scripts\python.exe"))) {
+    Write-Step "Creating virtual environment in .venv"
+    $bootstrapPython = Get-PythonSpec -RepoRoot $repoRoot -UseSystemPython $true
+    Invoke-Python -PythonSpec $bootstrapPython -Arguments @("-m", "venv", ".venv") -WorkingDirectory $repoRoot
+}
+
+$python = Get-PythonSpec -RepoRoot $repoRoot -UseSystemPython $SystemPython.IsPresent
+Write-Step "Using Python: $($python.Exe) $($python.BaseArgs -join ' ')"
+
+if ($UpgradePip) {
+    Write-Step "Upgrading pip/setuptools/wheel"
+    Invoke-Python -PythonSpec $python -Arguments @("-m", "pip", "install", "--upgrade", "pip", "setuptools", "wheel") -WorkingDirectory $repoRoot
+}
+
+Write-Step "Installing dependencies"
+Invoke-Python -PythonSpec $python -Arguments @("-m", "pip", "install", "-r", "requirements.txt") -WorkingDirectory $repoRoot
+
+Write-Step "Bootstrap completed"