feat(HJ): Chapter 3 — Advanced Analytical Mechanics (Hamilton-Jacobi)

Add Chapter 3 with 13 concept files covering:
- HJ Fundamentals: derivation, separation, action-angle, EM coupling
- Mechanics problems: free particle, projectile, SHO, Kepler, rigid rotator
- EM problems: uniform E-field, cyclotron, E×B drift, Coulomb

Also: manifest update (13 entries), macro additions (HJ + \bm + \dd override),
unicode cleanup, compilation fixes.
This commit is contained in:
2026-05-02 02:21:53 -05:00
parent 7cf82f52da
commit 1c1a575f6e
22 changed files with 3048 additions and 7 deletions

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