docs: add gws-axi, harvest-axi, specops, and gitsheets-axi to the catalog

[themightychris]

Adds four more Jarvus AXI tools to the Community catalog table, alongside the existing slack-axi:

AXI	Domain	Description
gws-axi	Google Workspace	Gmail, Calendar, Docs, Drive, and Slides behind one command, with multi-account write-safety — drafts mail, never sends.
harvest-axi	Time tracking	Review, log, and edit Harvest time entries by period — for yourself, your team, a project, or a client.
specops	Spec-driven dev	Spec-driven development for agents — and a demo of shipping an AXI embedded in a skill, not a standalone npm executable.
gitsheets-axi	Git-backed data	Read and mutate git-backed record sheets over the shell — TOON output, idempotent commits.

Notes:

• specops is intentionally framed to highlight that it distributes an AXI embedded within a Claude Code skill rather than as a standalone npm executable — a distribution pattern worth surfacing in the catalog.
• gitsheets-axi ships as a monorepo subpackage (published gitsheets-axi@1.3.x on npm) of JarvusInnovations/gitsheets — another packaging variant alongside the standalone-repo and embedded-in-skill patterns. Link points at packages/gitsheets-axi on main.
• Descriptions were reviewed against each tool's latest release and matched to the catalog's existing form (verb-led where it fits, " - " spaced hyphen rather than em-dash).

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