feat: improve skill scores for 5 core Rosetta skills

[rohan-tessl]

Hey @isolomatov-gd 👋

I ran your skills through tessl skill review at work and found some targeted improvements.

Here's the full before/after:

Skill	Before	After	Change
coding-agents-prompt-adaptation	10%	84%	+74%
requirements-authoring	10%	87%	+77%
requirements-use	10%	77%	+67%
load-context	25%	68%	+43%
reasoning	36%	65%	+29%

This PR is intentionally scoped to 5 skills to keep it reviewable — more can be improved in follow-ups or via automated review on future PRs.

Note: The source skills live in instructions/r2/core/skills/ and are propagated to plugins/ via scripts/plugin_generator.py. All changes target the source files only — plugin copies will regenerate automatically on the next sync.

Changes summary

All 5 skills:

• Fixed duplicate tags fields in YAML frontmatter (caused validation failures and 10% scores for 3 skills)
• Ensured description uses quoted string format without XML-like tags
• Removed generic <role> preamble sections (the agent doesn't need motivational framing)

coding-agents-prompt-adaptation:

• Restructured into explicit 8-step numbered workflow (detect → read → load KB → identify → HITL → adapt → validate → deliver)
• Consolidated best_practices into workflow steps to reduce redundancy
• Compressed pitfalls into categorized single-line entries

requirements-authoring:

• Added explicit 9-step numbered workflow replacing the scattered <authoring_flow> and <initialization> sections
• Consolidated SRP/DRY/KISS/MECE rule sections into a single <core_principles> block
• Merged <conflict_checks>, <gap_checks>, and <validation_rules> into a unified <validation_checklist>
• Combined <resources> and <templates> (they listed the same assets)
• Compressed <language_constructs> into a dense paragraph preserving all rules

requirements-use:

• Added explicit 7-step numbered workflow integrating the <process> steps with HITL gates
• Consolidated <requirement_usage_rules> and <ambiguity_and_conflict_rules> into the workflow and core_concepts
• Merged <resources> and <templates> sections

load-context:

• Expanded from 2 lines to a full skill with proper frontmatter (tags, license, metadata)
• Added 5-step workflow with clear blocking prerequisite semantics
• Added validation checklist and pitfalls section

reasoning:

• Restructured 7D flow from flat bullet lists into an explicit numbered workflow
• Made confidence feedback loop actionable: specific formula for weighted confidence, targeted retry of weakest sub-problem (not entire process)
• Consolidated best_practices into the workflow and pitfalls

Honest disclosure — I work at @tesslio where we build tooling around skills like these. Not a pitch - just saw room for improvement and wanted to contribute.

Want to self-improve your skills? Just point your agent (Claude Code, Codex, etc.) at this Tessl guide and ask it to optimize your skill. Ping me - @rohan-tessl - if you hit any snags.

Thanks in advance 🙏