docs: 0.5.0 README, and remove the prompt library from the front end

[squarezw]

Removing the prompt library

The prompt library had already stopped doing anything. resolve_app_prompt_body
dropped the legacy prompt_id fallback on 2026-07-31, so a digital employee's system
prompt comes from agent_md and nothing else.

Checked before deleting rather than assumed:

Apps still carrying a prompt_id	9
Of those, apps that already have an agent_md	9 — all of them
Does the chat runtime read the prompts table	No

So the menu entry pointed at a feature that no longer had an effect, with a "being
retired" notice attached to it. Removed: the pages, the API proxy routes, the
prompts i18n namespace, the sidebar entry, and the prompt_id field that was being
threaded through app types and payloads.

/monitoring/prompts went too. It was only ever a title mapping in DynamicTitle —
the page itself never existed, so the entry pointed at a 404.

AgentMdEditor no longer takes promptId. It only drove wording — "upgrade to
Agent.md" versus "create Agent.md" — and with no prompt library there is nothing to
upgrade from, so it always says create.

Deliberately kept, since they only share the word prompt: the workflow node's
systemPrompt field, the dataset promptType setting, the crawler's prompt, and
/api/v1/prompt-variables, which the skill editor uses.

The backend prompts table and its endpoints are untouched — the public chat API
still accepts an explicit prompt_id, and retiring that is a separate decision made
on the service side.

README

Switched to the new dashboard screenshot, which shows Digital Employees and Skills.

The caption states plainly that the greyed-out Prompt entry and the version badge
visible in the image predate this release. The screenshot was taken before these
changes, and a README hero image showing a menu item that no longer exists is exactly
the kind of small wrongness that confuses a new reader. Worth retaking once this
merges, after which the caveat can go.

Rewrote the prompts section from "being retired" to "removed", and added the built-in
skill-creator to the Skills section — it is the headline of 0.5.0 and the README did
not mention it. That paragraph leads with what it does and closes with what it cannot
do: approval stays a human action, and a draft's scripts are not in the executable set
until someone approves them.

Checks

246 passed. tsc reports 134 errors against a 135 baseline — one fewer, since the
deleted code carried one.

check:i18n still fails, exactly as it does on main: 3676 reported "missing keys"
there versus 3592 here, almost all of them URL strings the scanner mistakes for keys.
Pre-existing and unrelated to this change.

Net −1405 lines.

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