Fix from_dict() silently truncating dict keys that contain dots

[gaoflow]

Problem

ConfigFactory.from_dict() calls ConfigTree.put(key, value) for each item in the input dictionary. put() passes the key through ConfigTree.parse_key(), which splits on HOCON path-separator characters — including . — treating them as a path rather than a literal key.

This means a Python dict key like "myThing_r0.1" is stored as a nested path myThing_r0 → 1, silently dropping everything after the last dot:

d = {"myStuff": {"myThing_r0.1": ["someVal"]}}
cfg = ConfigFactory.from_dict(d)
list(cfg["myStuff"].keys())  # ["myThing_r0"]  ← .1 silently dropped

Reported in issue #335.

Fix

Two minimal changes:

pyhocon/config_parser.py — from_dict() now calls res._put([key], …) instead of res.put(key, …). Passing the key as a single-element path list bypasses parse_key() entirely, so the Python dict key is stored verbatim.

pyhocon/config_tree.py — ConfigTree.get() now first attempts an exact OrderedDict lookup before falling back to dotted-path traversal. This makes literal dotted keys stored by from_dict() accessible through the normal API (cfg["myThing_r0.1"], .items(), etc.) without breaking existing HOCON path traversal.

Testing

All 286 existing tests continue to pass. A new regression test (test_from_dict_preserves_dotted_keys) covers the reported scenario.

This pull request was prepared with the assistance of AI, under my direction and review.