Rename all transcripts: SESSION-<letter> → SESSION-NNNN.M (roadmap #23)

Executed in Session 0014.0 (= legacy "Session N"), 2026-05-28. The
session-protocol naming convention switched from alphabetical letters
(SESSION-A through SESSION-M, plus SESSION-M.1/M.2/M.3 subsessions) to
zero-padded 4-digit session numbers with a subagent ordinal suffix
(SESSION-0001.0 through SESSION-0013.0, plus SESSION-0013.1/.2/.3).

Rationale: alphabetical ordering breaks down after Z (does AA sort
before B in a filesystem? a glob?), and the convention doesn't
generalize to deeper structure. The numeric form addresses both, and
the explicit `.0` for the main driver transcript makes the parent-vs-
subagent distinction visible at first glance.

Mapping (all 16 transcripts):
  A    → 0001.0
  B    → 0002.0
  C    → 0003.0
  D    → 0004.0
  E    → 0005.0
  F    → 0006.0
  G    → 0007.0
  H    → 0008.0
  I    → 0009.0
  J    → 0010.0
  K    → 0011.0
  L    → 0012.0
  M    → 0013.0
  M.1  → 0013.1
  M.2  → 0013.2
  M.3  → 0013.3

This commit uses `git mv` for each rename so Gitea's rename detection
records each as a file-was-renamed event rather than file-was-deleted-
and-recreated. The transcript bodies are NOT rewritten — they still
read "Session I" / "Session M.1" / etc. internally; the body's session
reference and the filename's numeric form are both authoritative.
Readers map back via the table above.

External references to the old paths
(e.g. wiggleverse/ohm-session-history/SESSION-I-TRANSCRIPT-…md) will
404 after this rename. The audit trail is in this git log; readers
who care can trace. No redirect tombstones were added.

The publish-transcript.sh validator was extended to accept both the
numeric form (binding from 0014.0 onward) AND the legacy letter form
(so renamed-old-files remain re-publishable if their content is later
corrected). See ohm-infra/scripts/publish-transcript.sh and
ohm-infra/SESSION-PROTOCOL.md §1 (binding spec) for the new
convention.

Session 0014.0 is the first session to ship under the new naming
end-to-end.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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