docs(ai-docs): playright agents.md and spec generator added

[rsarika]

COMPLETES #N/A (documentation update)

This pull request addresses

Playwright E2E documentation and agent routing were incomplete for contributors working in this monorepo. Specifically, root-level guidance did not consistently route developers/agents to Playwright ai-docs, and there was no implementation-ready spec document checked in for the multiparty conference coverage that is being executed in SET_7.

by making the following changes

• Updated root /AGENTS.md to explicitly include Playwright in architecture understanding and documentation update flows.
• Updated playwright/ai-docs/AGENTS.md with Playwright framework usage, setup patterns, utility guidance, and contributor-facing references.
• Updated ai-docs/templates/Playright/playright-test-spec-generator.md to align with current framework constraints and conventions (including SET_7, current TestManager capacity, heading/style rules, and routing-sensitive naming guidance).
• Added playwright/ai-docs/specs/multiparty-conference.spec.md with implementation-ready scope, constraints, coverage IDs, environment requirements, lifecycle/cleanup behavior, and stabilization rules.

Change Type

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling change
• Internal code refactor

The following scenarios were tested

• The testing is done with the amplify link
• Executed yarn
• Executed yarn run build
• Pre-commit automated test hooks executed successfully during commit

The GAI Coding Policy And Copyright Annotation Best Practices

• GAI was not used (or, no additional notation is required)
• Code was generated entirely by GAI
• GAI was used to create a draft that was subsequently customized or modified
• Coder created a draft manually that was non-substantively modified by GAI (e.g., refactoring was performed by GAI on manually written code)
• Tool used for AI assistance (GitHub Copilot / Other - specify)
  • Github Copilot
  • Other - Please Specify
• This PR is related to
  • Feature
  • Defect fix
  • Tech Debt
  • Automation

Checklist before merging

• I have not skipped any automated checks
• All existing and new tests passed
• I have updated the testing document
• I have tested the functionality with amplify link

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