PE hyperstack: release 1.2.0 (personas vertical)

[KailasMahavarkar]

Cuts v1.2.0, shipping the two new personas to everyone.

What this release contains (already on main)

• Personas vertical (Layer 4) - domain-expert lenses, gate + capability modes.
• product-manager persona (gate, 15 tools) - owns value+viability; full decision arc.
• marketing persona (capability, 17 tools, 25-snippet corpus) - product marketing for any brand.

Release mechanics

This PR only bumps versions + CHANGELOG. On merge to main, publish.yml:

1. runs the verify matrix (tests),
2. creates GitHub release v1.2.0 (--generate-notes),
3. builds + pushes ghcr.io/orkait/hyperstack:1.2.0, :latest, :main.

Installs that pull :main/:latest already have the personas; this gives them a stable :1.2.0 tag + a versioned release.

Verification

bun test     77 pass / 0 fail
tsc          clean
versions     all manifests -> 1.2.0 (was 1.1.0 / 1.1.1 / 1.0.0)
counts       15 plugins · 114 tools · 26 skills · 2 personas