Add ontodag-fs to Tools

[petfold]

Adds ontodag-fs to the Tools section.

[ontodag-fs](https://github.com/petfold/ontodag-fs) - Browse an OntoDAG category lattice as a read-only fsspec and FUSE filesystem where directory paths are queries and file content is stored on Swarm.

What it is. A semantic filesystem in the tradition of Gifford's Semantic File System: directory names are interpreted as queries rather than locations, so /pet/dog means "everything that is a pet and a dog" and /dog/pet is the same place. One file appears under every path it belongs to — no copies, no symlinks. Paths can also carry typed bounds, e.g. ls '/parcel/weight(..5kg)/.all', computed exactly. Ships an odag-fs CLI (ls, tree, cat, info, an interactive prompt, --as-of ROOT for past versions) and a FUSE mount via fusepy.

Swarm relation. File content lives on Swarm, fetched through swarmfs (already listed here); the classification lattice persists through recordstore (also listed) against a Bee node. A file's identity is its Swarm content address, so a classification can never dangle — there is nowhere for the content to move to. The repo owns no state of its own; OntoDAGFileSystem is a plain fsspec backend, so the whole fsspec ecosystem (pandas, pyarrow, DuckDB, …) reads Swarm-backed content through it too. Verified against a live Bee light node on Gnosis mainnet.

Status is stated honestly in the description and the repo: v0 is a read-only view — browsing is complete and tested; filing through the filesystem is in progress.

Checklist

• One item, one PR.
• Public, not archived, BSD-3-Clause LICENSE, active (last push 2026-08-06).
• Link resolves; description is 147 characters, sentence case, matches this repository (not its sibling ontodag).
• Not already listed in README.md / archived.md, and no open PR or issue for it.

🤖 Generated with Claude Code

[crtahlin]

Approving — entry checks out.

• Format: 147 characters, sentence case, link resolves, not already listed.
• Repository: public, not archived, BSD-3-Clause, actively developed, with tests and a spec.
• Description matches this repository rather than the sibling ontodag, and is honest that v0 is read-only.
• Tools works as the section: the odag-fs CLI and the FUSE mount are the user-facing surface, which distinguishes it from swarmfs in Libraries.

I rebased the branch onto main and force-pushed, since #43 normalised the repository to LF line endings and landed between your submission and this review. That turned the diff from +152/−150 into the two lines actually being added; your authorship is unchanged. Apologies for touching your branch — it was our change that caused the conflict, and the fix was already verified locally.