Spec docs contain stale crate paths after rename

[aram356]

Problem

After the crate rename (crates/common → crates/trusted-server-core, crates/fastly → crates/trusted-server-adapter-fastly), several spec documents in docs/superpowers/specs/ contained stale file path references that caused vitepress dead link errors during build.

Affected files

• docs/superpowers/specs/2026-03-11-production-readiness-report-design.md — 77 dead links
• docs/superpowers/specs/2026-03-19-edgezero-migration-design.md
• docs/superpowers/specs/2026-03-24-ssc-technical-spec-design.md
• docs/superpowers/specs/2026-03-25-streaming-response-design.md

Resolution

Fixed in #596:

• Updated all stale crate paths to the new names
• Converted source code file references from markdown links to backtick references, since vitepress cannot resolve paths outside the docs/ directory
• Fixed prettier formatting