nvidia-holoscan / holoscan-cli / 30244872396

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feat: add --json to list/modes/env-info/version and remove the workflow project type (#205)

* feat: add --json to list, modes, env-info, and version

Completes the F3 "--json on every read verb" surface from the agentic-CLI
design. `status` and `env-check` already emitted JSON; this adds the same
opt-in `--json` flag to the four remaining read commands so agents can parse
discovery and diagnostic output instead of scraping prose:

* `list --json`     — {projects: [{name, project_type, source_folder,
                      language[], modes[]}]}. Includes source_folder, the one
                      field agents previously had to guess.
* `modes --json`    — the resolved metadata.modes object plus project/language.
* `env-info --json` — full structured host report. env_info.py grows a
                      parallel `gather_*` data layer beside the `collect_*`
                      prose printers (the status.py collect/format split);
                      only one path runs per invocation.
* `version --json`  — package/version/executable/module.

All payloads flow through a new utils/json_output.dumps that injects an
additive `schema_version` (1) as the first key; the same wrapper is
retrofitted onto the existing status/env-check JSON (additive, no field moves).
Env-var name lists and the Python-environment classification are extracted to
single-source helpers shared by the prose and JSON renderers.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* refactor: remove the workflow project-type concept

Mirrors holohub#1646 ("Remove Holohub Workflow Concept Entirely"), which
folded the AI Surgical Video workflow into applications and dropped the
workflow type: it has no meaningful difference from an application.

Removes the workflow project type across the CLI:
* delete metadata/workflow.schema.json (packaged via the *.schema.json glob)
* drop the "workflows" dir + "workflow" schema from METADATA_DIRECTORY_CONFIG,
  gather_metadata S... (continued)

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