Fix the Prologue Extractor command and default the Screenplay model folder

[woksin]

Changed

• The Screenplay MCP server and other Screenplay commands now use <project>/Screenplay as the model folder when Source or src holds no .play files or Screenplay state, instead of treating the application's source folder as the model. (Screenplay MCP picks src as model root in projects without a model #428)

Fixed

• prologue start now prints an Extractor docker run command that mounts your captures folder into the container, so captures are no longer lost when the container exits, and publishes the OpenTelemetry ports 4317 and 4318 when you capture from OpenTelemetry. The command pins the Extractor image to the bundled Prologue version, and cratis-prologue.json keeps the captures folder you chose, so prologue interpret finds the captures without a path. (prologue start prints an Extractor docker command that loses captures and hides OTLP ports #426)

[woksin]

Reviewer notes (not release notes):

• Combines cli#426, cli#428 and the Screenplay 4.232.0 bump into one release (CI/release economy).
• Local gate on f4386d4 (after merging origin/main with Stage 4.186.0): dotnet build Cli.slnx -c Release -warnaserror 0 warnings/0 errors; dotnet test Source/Cli.Specs -c Release 4946 passed, 0 failed, 6 skipped (Windows-only). Templating.Specs not run locally (no Templating changes).
• Review workflow (Opus + Sol): round 1 found 2 blocking issues in the Extractor command (saved captures folder overwritten; image tag 1.0.0 instead of 2.0.0); both fixed, round 2 passed with 0 blocking. Sol confirmed Prologue__Output__Json__Directory against the Prologue 2.0.0 configuration binding.
• Merge order: merge only after Cratis/Studio#2136 (Screenplay 4.232.0) merges, so the Studio CLI-parity check lines up.
• Authored as woksin, so no reviewer request; assigned only.

[einari]

Heads-up: Stage 4.187.1 needs Screenplay >= 4.236.0 (NuGet downgrade rule), so the Stage bump PR for Cratis/Stage#596 moves ScreenplayVersion to 4.236.0 too. If this PR merges first, that one is a one-line rebase of the Screenplay pin.