feat(studio): daily Today-Hero proposal pipeline (v0.31.0)

Cross-store research (Apple, Play, Steam, Docker, VS Code,
Chrome Web Store, Flathub) consistently rewards editorial
curation over algorithmic recommendations — but manual
copywriting per release does not survive a solo-dev cadence.
This commit lands a daily-build pipeline so the Today-Hero
card stays fresh without operator hand-edits per release.

Pipeline shape (full design in docs/today-pipeline.md):

1. tools/today/collect.sh aggregates "what happened in the
   last 24 hours" across the F∆I monorepos: git log per repo,
   store-index seed.yaml diffs, architecture/system-gaps doc
   changes, Studio release tags, and (opt-in) audit-log
   highlights. Outputs plain text.

2. tools/today/propose.sh feeds the signal summary plus
   prompt.template.md to the operator's already-configured
   System-AI (Ollama default; OpenAI-compatible endpoints
   work via env-var override). Drafts N candidate stories as
   YAML files under ~/.fai/today/proposals/<date>/.

3. tools/today/accept.sh validates a chosen candidate against
   the today/v1 schema and the no-marketing-speak banned-word
   list, then atomic-renames it into ~/.fai/today/active.yaml.

4. Studio reads active.yaml at store-page init via the new
   TodayStoryLoader (lib/data/today_story_loader.dart). On any
   failure (file missing, schema mismatch, banned-words hit,
   parse error) it falls back to the compiled-in
   _kFallbackTodayStory so KRITIS deployments and fresh
   installs always render something sensible.

Trust + audit:
- All proposed and accepted stories live as plain YAML on disk.
- The pipeline calls only the operator's already-configured
  System-AI; it never reaches a CMS, never phones home, works
  air-gapped if the System-AI does.
- The bash accept gate AND the Dart loader both enforce the
  banned-word list — a hand-edited active.yaml that bypassed
  the shell still won't reach the UI.
- Removing the cron entry disables the pipeline; Studio falls
  back to the const story and continues to work.

Cron / launchd / systemd recipes documented in
tools/today/README.md.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

pubspec.yaml

@@ -1,7 +1,7 @@
 name: fai_studio
 description: "F∆I Studio — desktop GUI for the F∆I hub"
 publish_to: 'none'
-version: 0.30.0
+version: 0.31.0
 
 environment:
   sdk: ^3.11.0-200.1.beta
@@ -21,6 +21,10 @@ dependencies:
   shared_preferences: ^2.5.5
   # Inline README rendering inside the Store detail sheet.
   flutter_markdown: ^0.7.7
+  # Today-Hero pipeline reads accepted stories from
+  # ~/.fai/today/active.yaml — see docs/today-pipeline.md.
+  yaml: ^3.1.2
+  path: ^1.9.0
 
 dev_dependencies:
   flutter_test: