release: prepare Agora CLI v0.2.9

[digitallysavvy]

Prepare Agora CLI v0.2.9 with consistent quickstart environment setup, explicit project selection, Android onboarding, Windows installer compatibility, dependency maintenance, and expanded test coverage.

This release incorporates the work from #57, #58, #59, and #60.

Changes

• Add the Android conversational AI client/server quickstart to agora init and agora quickstart.
• Write Python and Go credentials to server/.env using AGORA_APP_ID and AGORA_APP_CERTIFICATE.
• Remove generation of unsupported APP_ID and APP_CERTIFICATE names.
• Add quickstart create --template-only for explicit clone-only workflows.
• Prompt interactive users to select a project when no project context resolves.
• Return QUICKSTART_PROJECT_REQUIRED before cloning in JSON, CI, non-TTY, and --yes workflows without a project.
• Expose template-only quickstart creation through MCP.
• Add PowerShell 7 detection and actionable execution-policy guidance.
• Upgrade the Go toolchain to 1.26.6 to resolve reachable standard-library vulnerabilities.
• Upgrade actions/setup-node and actions/setup-go to v7.
• Expand quickstart environment and project-resolution documentation.
• Prepare the changelog and command reference for v0.2.9.

Testing

• go test ./...
• Overall statement coverage: 75.0%
• internal/cli statement coverage: 75.1%
• cmd/gendocs statement coverage: 93.9%

Coverage includes public CLI behavior for:

• Quickstart and init workflows
• Project and webhook commands
• Config, telemetry, logout, and completion commands
• Install doctor success and failure states
• Upgrade checks, downloads, checksums, and archive extraction
• Command-reference generation

Release dependencies

The following upstream quickstart migrations must merge before publishing v0.2.9:

• fix: align python quickstart environment setup AgoraIO-Conversational-AI/agent-quickstart-python#26
• fix: align go quickstart environment setup AgoraIO-Conversational-AI/agent-quickstart-go#8

Compatibility note

agora quickstart create no longer silently performs a clone-only workflow when no project resolves. Use --template-only explicitly, select a project interactively, or provide --project for deterministic automation.