spec: README.md — spec-index titles match the spec headers

[JarbasAl]

Aligns the README spec index with each spec file's own header title (the index drops the trailing "Specification" by convention):

• OVOS-SESSION-1 — "Session Carrier Wire Shape" → "Session" (session-1.md is the Session Specification).
• OVOS-INTENT-4 — "Intent and Entity Registration" → "Intent and Entity Registration Bus Contract" (the file's full header title).

All other listed titles and Version values were checked against the spec headers and match.

Not fixed here (out of scope; each lands in its own per-file PR): the stale in-body citation "Session Carrier Wire Shape Specification" for OVOS-SESSION-1 still appears in persona.md, common-query.md, fallback.md, session-2.md, intent-context.md, and converse.md, plus the CHANGELOG.md section heading.

Non-normative — no CHANGELOG entry.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9003dcd and 1a24db4.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch spec/readme-index

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