docs: fill README gaps for staging features

[biodrone]

Summary

• Expand Post-Download Script Hook docs: executable requirement, live+VOD coverage, STREAMDL_POST_SCRIPT_TIMEOUT, and Docker volume mount example
• Add Tick Notices section explaining the --- notices --- log block and deduplication behavior
• Fix README link to config/config.yml.example and add a commented post_script line to the example config

Test plan

• Docs-only change; no code or CI impact
• Review README renders correctly on GitHub

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Run ID: 7f3b6901-dad2-4ad2-8966-bf52fb778d77

📥 Commits

Reviewing files that changed from the base of the PR and between 0f40fba and 017f08b.

📒 Files selected for processing (2)

• README.md
• config/config.yml.example

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/staging-readme-gaps

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