docs: generate docs for all CLI commands

[jaxxstorm]

Signed-off-by: Lee Briggs lee@leebriggs.co.uk

[Copilot]

Pull request overview

This pull request introduces comprehensive documentation infrastructure for the tscli CLI tool by adding a Docsify-based documentation site with automated command reference generation from Cobra metadata.

Changes:

• Adds Docsify documentation site with automated command reference generation from Cobra
• Implements docs-generate, docs-check, and docs-serve Make targets
• Integrates documentation verification into CI pipeline to prevent stale docs

Reviewed changes

Copilot reviewed 133 out of 135 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/docs/docs_test.go	Tests verifying required documentation files exist and contain expected markers
openspec/changes/docsify-docs-and-command-markdown/*	Comprehensive OpenSpec documentation including proposal, design, specs, and completed tasks
coverage/docsgen/main.go	Documentation generator implementing generate and check modes with proper cleanup and error handling
docs/index.html	Docsify entrypoint with Vue theme and custom configuration
docs/getting-started.md	User-facing getting started guide with installation and first commands
docs/configuration.md	Configuration documentation covering keys, profiles, and precedence
docs/authentication.md	API key authentication methods and security guidance
docs/command-reference.md	Index page explaining command reference structure and regeneration workflow
docs/commands/*	109 generated command reference pages with usage, flags, and cross-references
README.md	Updated with documentation section, quick start examples, and common workflows
Makefile	New targets for docs-generate, docs-check, and docs-serve
.github/workflows/ci.yml	Added docs-check step to verify generated docs stay current
go.mod, go.sum	Added transitive dependencies for Cobra markdown generation

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