WIP: docs: add Feature & Component Modelling How-To and Requirements Inspection agent

[antonkri]

WIP

For now, just for sharing with other colleagues, no merging planned yet

Summary

Adds a practical, step-by-step Feature & Component Modelling How-To plus the Requirements Inspection agent that automates the first inspection checklist.

Contents

docs/contribute/development/modelling_howto.rst (new, linked from docs/contribute/development/index.rst)

Step-by-step guide covering the reduced metamodel actually in use today:

• Which sphinx-needs directives to write on the feature side (score repo: stkh_req, feat_req, feat, logic_arc_int(_op)) vs. on the realisation side (module repos: feat_arc_sta/_dyn, mod/mod_view_sta, comp/comp_arc_sta, comp_req).
• The required cross-repo links (belongs_to / fulfils / satisfies / implements).
• Where each inspection checklist lives and how to set it up, with direct links to the official process_description folder templates (pinned to v1.5.4, the version score consumes via bazel_dep).
• Step 5 sub-section explains how to invoke the new Requirements Inspection agent.

.github/agents/req-inspection.agent.md + .github/skills/req-inspection-checklist/SKILL.md (new)

• Agent definition and companion skill.
• Scaffolds and fills chklst_req_inspection.rst for a single S-CORE feature per invocation.
• Scope: feature-level feat_req inspections in the score repo. Component-level comp_req inspections in module repos are not yet supported and the agent stops when given a module/component name.
• Invocation: copilot --allow-all-tools --agent "Requirements Inspection" -p "<feature-name>"

Build

bazel run //:docs_check passes (only the 6 pre-existing non-fatal warnings on lifecycle remain, unrelated to this change).

[github-actions]

The created documentation from the pull request is available at: docu-html