feat(pinn): add pinn/ sub-skill with SKILL.md and evidence

SKILL.md: 478-line PINN training best practices (complexity ladder,
nondim, architecture, optimization, loss design, sampling, property
mappings, ConFIG, domain decomposition).

docs/evidence/: 6 files -- krishnapriyan2021, sukumar2022, wang2022
causal, wang2022+2023 expert guides, Brunton youtube transcripts.

Missing evidence (to fetch): Wang 2001.04536 (gradient pathologies),
Rathore 2402.01868 (ICML loss landscape).

Author: wassname (https://github.com/wassname)
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wassname committed 2026-03-06 11:48:41 +08:00
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