⚡ Bolt: [performance improvement] fast-path string checks and batched hashing

[alinelena]

💡 What:

1. Added fast-path string literal checks ("Buckingham" in txt, "E(Eh)" in txt) to parse_quadrupole and parse_eigens before executing complex regular expressions.
2. Optimized geom_sha1 by building the string first with "".join(generator) and calling .encode() and hash.update() exactly once, rather than calling them inside a loop for every atom.

🎯 Why:

1. Evaluating complex regular expressions on large text blocks is slow, especially when the text typically doesn't contain the target data. A simple string literal check bypasses the regex engine entirely.
2. Iterative .encode() and .update() calls inside tight loops add unnecessary invocation overhead.

📊 Impact:

1. Fast-path checks bypass regex evaluation making "miss" checks ~8x faster in microbenchmarks.
2. Batching strings before hashing provides a ~10% speedup for molecular fingerprinting operations.

🔬 Measurement:
Run unit tests with python -m pytest -k "not mpi and not test_restart_5ranks_matches_serial" tests/ to verify functionality. Performance impacts can be verified using the microbenchmarks ran during implementation (recorded in the agent trace).

---

PR created automatically by Jules for task 15088213419807703821 started by @alinelena

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.