feat(agent): add global and repo-local agent integrations

[jaxxstorm]

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[Copilot]

Pull request overview

Adds a new tscli agent command group that generates and refreshes repo-local or user-global “AI agent integration” assets (instructions/skills/prompts) derived from the live Cobra command tree, and wires the new surfaces into docs + test coverage.

Changes:

• Introduces tscli agent init / tscli agent update and the underlying bundle installer/manifest logic.
• Adds generated docs pages + docs navigation updates for the new agent functionality.
• Extends CLI/docs tests and example-output coverage to include the new commands and artifacts.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/docs/docs_test.go	Requires the new docs/agents.md page and agent command docs artifacts.
test/cli/testdata/leaf_commands.txt	Updates leaf-command manifest to include agent init / agent update.
test/cli/example_output_test.go	Adds example-output coverage for agent init / agent update with dynamic temp dirs.
test/cli/agent_integration_test.go	New integration tests verifying generated assets for local/global installs and update refresh behavior.
README.md	Documents the new agent init/update workflow.
pkg/agent/install.go	Implements tool/scope selection, manifest handling, asset rendering, and managed file writes.
pkg/agent/install_test.go	Unit tests for init/update behavior and manifest/tool handling.
internal/cli/root.go	Registers the new agent command and skips config resolution for agent subcommands.
docs/README.md	Adds “AI Agent Integrations” links to docs entry points.
docs/commands/tscli.md	Links the generated tscli agent command page.
docs/commands/tscli_agent.md	Generated docs for tscli agent.
docs/commands/tscli_agent_update.md	Generated docs for tscli agent update.
docs/commands/tscli_agent_init.md	Generated docs for tscli agent init.
docs/commands/README.md	Adds agent command pages to generated command index.
docs/commands/_sidebar.md	Adds agent command pages to generated commands sidebar.
docs/agents.md	New documentation page describing generated assets and workflows.
docs/_sidebar.md	Adds “AI Agents” to the main docs sidebar.
cmd/tscli/agent/update/cli.go	Implements the tscli agent update Cobra command wrapper.
cmd/tscli/agent/init/cli.go	Implements the tscli agent init Cobra command wrapper.
cmd/tscli/agent/cli.go	Adds the tscli agent parent command and wires subcommands.

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