Add TB Input/Output documentation for issue #356

[Vaishali171]

Fixes #356

Changes done:

• Added documentation for TB Input and TB Output (auto-generated Testbench elements)
• Verified behavior hands-on in the simulator by creating and running a test circuit
• Embedded a live demo circuit showing TB Input/TB Output in action

Note: Controlled Inverter (also mentioned in #356) is already documented via PR #513 — this PR covers TB Input/TB Output only.

Screenshots:

Preview Link(s):

✅️ By submitting this PR, I have verified the following

• Checked to see if a similar PR has already been opened 🤔️
• Reviewed the contributing guidelines 🔍️
• Sample preview link added (add a link from the checks tab after checks complete)
• Tried Squashing the commits into one

Summary by CodeRabbit

• Documentation
  • Added guidance on the automatically generated TB Input and TB Output blocks created when a test is attached.
  • Explained displayed information, customizable properties, and “Paired” status behavior.
  • Included an interactive live demo.

[coderabbitai]

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 5259645f-4001-4ba3-b776-95b22fa6904c

📥 Commits

Reviewing files that changed from the base of the PR and between e131d2e and f6e795a.

📒 Files selected for processing (1)

• docs/chapter7/3testcircuits.md

Walkthrough

Added a documentation section for automatically generated TB Input and TB Output blocks. The section describes displayed fields, customizable properties, pairing behavior, selection highlighting, and an embedded live demo.

Merge Risk: 🔵 Low · up to e131d

This documentation-only change adds guidance for TB Input and TB Output, but parts of the current text could mislead users about displayed fields, pairing behavior, supported properties, and iframe markup. The PR is otherwise mergeable with explicit owner awareness and follow-up on these bounded documentation corrections.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR fulfills the TB Input and TB Output documentation requirements from issue #356. The provided context states that Controlled Inverter documentation was completed previously in PR #513.
Out of Scope Changes check	✅ Passed	The changes are limited to documentation for the testbench elements requested by issue #356. No unrelated changes are identified.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the main change: adding TB Input/Output documentation. The issue reference provides useful context without making the title vague.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 5

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d3d2329a-c1d3-4e39-9dae-2d56eac964af

📥 Commits

Reviewing files that changed from the base of the PR and between 9d32941 and e131d2e.

📒 Files selected for processing (1)

• docs/chapter7/3testcircuits.md

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