doc(console): Adds add_renderable example and apply-live demo

[EspenAlbert]

Summary

• Adds tested example docs for add_renderable at docs/examples/console/add_renderable.md: dynamic __rich_console__ renderables, wiring into the live region, and CI vs TTY rendering notes.
• Adds examples/apply_live/, a standalone Typer demo (no tfdo import) that streams terraform apply -json -auto-approve through ask-shell message_callbacks with skip_progress_output=True.
• Includes a Terraform workspace with four chained time_sleep resources (~20s fresh apply) and a minimal NDJSON stream handler using add_renderable locally plus logger.info heartbeats when interactive_shell() is false.
• Registers the example in pkg-ext (examples_include), mkdocs nav, and ask_shell/test_docs.py.
• Adds just apply-live and a CI job that runs checkout, setup, Terraform 1.12.1 (terraform_wrapper: false), and just apply-live with CI=true.

apply-live demo

Run locally from code/ask-shell/:

just apply-live
CI=true just apply-live   # heartbeat log lines instead of live panel

The CLI always runs terraform init -input=false before apply so a clean checkout works without a separate init step. Re-run after the first apply is a no-op; reset with terraform destroy -auto-approve in examples/apply_live/workspace/.

Test plan

• uv run pytest ask_shell/test_docs.py -k add_renderable
• uv run pytest examples/apply_live/stream_handler_test.py
• just pre-commit-ask
• CI=true just apply-live (local)
• CI apply-live job on GitHub Actions

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.80247% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.61%. Comparing base (dfcb93f) to head (e1e0ab3).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
examples/apply_live/stream_handler.py	84.28%	22 Missing ⚠️
ask_shell/_internal/rich_live.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   85.56%   85.61%   +0.04%     
==========================================
  Files          20       21       +1     
  Lines        1878     2037     +159     
==========================================
+ Hits         1607     1744     +137     
- Misses        271      293      +22     

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