Create tracking issues for each document in protocol-specifications-v2/docs/

## Context
Sprint 02 — Documentation hygiene for `beckn/protocol-specifications-v2`.

The `docs/` directory contains design documents, governance guides, and spec artefacts that have no corresponding GitHub tracking issues. Without issues, there is no clear owner, no milestone, and no way to track whether each document is current.

## Problem
Documents in `docs/` (and sub-directories) were created during earlier phases but have never been formally tracked per-file. Some may be stale or incomplete relative to the current two-tier API architecture (transport layer frozen, schema registry evolving separately).

## Tasks
- [ ] List all files in `docs/` and sub-directories (including `docs/governance/`)
- [ ] For each document, create a GitHub issue:
- Title: `"Update/review : "`
- Body: current status, what needs updating, acceptance criteria
- Assignee: @ravi-prakash-v
- Labels: `documentation`, `sprint-02`
- Milestone: Sprint 02
- [ ] Close this meta-tracking issue once all per-document issues are created and linked as sub-issues

## Acceptance criteria
- Every file in `docs/` has a corresponding open GitHub issue tracking its review/update status
- SDF-1 and SDF-2 are already handled separately and should be linked but not duplicated
- Each per-document issue has correct assignee, labels, and milestone
- This issue is closed with a comment listing all created sub-issue links

## Related
- S02-G: same task for `beckn/schemas/schema/docs/`
- SDF-1 (#107): governance/STYLE_GUIDE.md already tracked
- SDF-2 (#108): governance/CONTRIBUTING_SCHEMAS.md already tracked

Assigned: @ravi-prakash-v