docs: 3.12.1 — one positioning line, ICP first

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Summary

FDEOps described itself three different ways depending on where you landed — README hook, npm description, plugin manifests. This settles on one line, chosen by @suboss87:

Forward deployed engineering skills with memory, for AI coding agents.

It names the ICP in the first three words, so an FDE self-identifies before reading anything else, and it stops us competing in the crowded "agent skills" category on breadth we don't have — memory is the differentiator, skills are the delivery mechanism.

Applied to README.md, package.json, plugin.json, .claude-plugin/plugin.json, and both marketplace.json descriptions. The README's old hook ("your agent forgets your client every morning") isn't lost — it moves down into the opening paragraph, where the pain belongs once the category is established.

The last three "second brain" phrasings went with it (AGENTS.md, skills/fde/SKILL.md, docs/skills-reference.md) — vague, and taken.

Version: 3.12.1, and why not 3.12.0. The v3.12.0 tag exists but the publish step failed on ENEEDAUTH — the repo still has no NPM_TOKEN secret — so 3.12.0 never reached the registry. Rather than re-point a pushed tag, the CHANGELOG marks 3.12.0 (tagged, unpublished) and 3.12.1 becomes the first release carrying the vocabulary work. All four manifests bumped together, which the plugin version aligned gate checks.

Docs and manifests only — no CLI behavior change. npm run check green (gates + 120 tests).

Link to Devin session: https://app.devin.ai/sessions/f135381c4682413bae73dff38eb6d1a3
Open in Devin Desktop: https://app.devin.ai/desktop/session/f135381c4682413bae73dff38eb6d1a3?variant=devin

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Superseded — closing rather than resolving the conflicts.

The positioning line this PR proposed landed in #56 (and without "with memory", per the later decision to keep the headline to the category and let the paragraph carry memory). Main is now 3.14.1, so the 3.12.1 bump here is also stale. The remaining piece — methods → skills in the public copy — is in #60, rebased on Main.