[#189]:svarga:docs, add AI skill knowledge base for h5cpp usage patterns

[steven-varga]

Summary

• Scaffolds docs/skills/ with 6 verified skill files covering core I/O patterns: includes, file/dataset create, write, read, append/packet-table, and property list composition
• Every snippet tagged tested: true has all its h5::* API calls verified against the declared test/example source files
• Adds scripts/verify-skills — a CI guard that checks skill snippet accuracy against the test suite and exits non-zero under --strict on drift
• 31 snippets checked, 0 unverified on merge

Skill files

File	Topics
index.md	tag index, known constraints, agent access instructions
includes.md	entry points, h5cpp/all vs core+io sandwich
io-create.md	h5::create for files and datasets, RAII handles, chunked layout
io-write.md	one-shot write, partial write, offset/stride/count/block
io-read.md	full read, pre-allocated buffer loop, hyperslab, type constraints
io-append.md	packet table, scalar/vector/string append, flush semantics
properties.md	operator| composition, dcpl/fapl/lcpl/fcpl, defaults

Test plan

• python3 scripts/verify-skills --project-root . --strict exits 0
• All skill files render correctly as Markdown (no broken tables or fences)
• scripts/mem import-file docs/skills/index.md loads without error (for knowledge store integration)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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