docs: update the public site for the current Waveframe product and v0.5.6 stack

[Wright-Shawn]

Problem

The public site is materially behind the shipped product:

• updates.html still presents Guard v0.13.0 and Cloud v0.3.0 as the current release ledger.
• index.html and tools.html present Guard Inspector as the hosted commercial investigation surface.
• Current coordinated releases are Cloud v0.5.6, Guard v0.15.0, Contract Compiler v0.4.0, Ledger v0.5.0, CRI-CORE v0.13.0, and Proposal Normalizer v0.2.0.
• The current product boundary is Waveframe Cloud as the paid service, Waveframe Console as its web UI, Guard as the developer/runtime boundary, Ledger as authority publication, and Local Inspector as the local/offline companion.

This creates GTM friction precisely when the v0.5.6 governed coding-agent workflow is becoming the canonical five-minute demonstration.

Required outcome

Bring the public site into agreement with the current shipped product and release matrix without expanding the architecture.

Acceptance criteria

• Update the release ledger through Cloud v0.5.6, Guard v0.15.0, and Compiler v0.4.0.
• Present Waveframe Cloud + Console as the paid hosted product and human operating surface.
• Present Guard as the installable developer integration and execution boundary.
• Present Waveframe Ledger as deterministic authority authoring/publication while retaining the governance-ledger package name where install compatibility requires it.
• Reframe standalone Guard Inspector as Local Inspector for local/offline workflows; hosted investigation belongs in Console.
• Add one direct five-minute governed coding-agent demo/quickstart path once the v0.5.6 hosted promotion is proven.
• Remove stale version and repository references from updates.html, compatibility.html, tools.html, and SUBMODULE_OVERVIEW.txt.
• Validate internal links and complete a successful Pages deployment.

Boundary

The site should explain and verify the existing product. This issue does not introduce a new product, repository, architecture, or enforcement capability.