fix(gitignore): anchor logs/checkpoints/models rules to repo root (#20)

[bradsmithmba]

Summary

.gitignore had three unanchored project-specific directory rules:

logs/
checkpoints/
models/

An unanchored directory pattern matches a directory of that name at every level, so these matched src/logs/, src/checkpoints/, and src/models/ as well as the intended root-level artifact directories. Any module added under those source directories is silently ignored by git and never committed — the same class of bug that hid the data layer in #1.

Closes #20.

Reproduction (before)

$ git check-ignore -v src/models/integrated_selector.py
.gitignore:168:models/	src/models/integrated_selector.py

Change

Anchor each rule to the repository root:

/logs/
/checkpoints/
/models/

Verification

src/models/foo.py        -> not ignored   (was ignored)
src/logs/foo.py          -> not ignored   (was ignored)
src/checkpoints/foo.py   -> not ignored   (was ignored)
models/ckpt.pt           -> ignored       (intent preserved)
logs/run.log             -> ignored       (intent preserved)
checkpoints/m.pt         -> ignored       (intent preserved)

Note

The sibling data/ rule has the identical bug and is anchored to /data/ in the PR for #1 (#19). This PR intentionally leaves data/ untouched to avoid overlapping diffs; the two PRs change different lines and merge cleanly.

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