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docs(todos): file P3 follow-up — carve the shared {{PREAMBLE}} reference blocks

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Surfaced by /plan-eng-review on the plan-ceo-review carve: per-skill section
carves stay modest because the ~40-50KB shared preamble dominates the
always-loaded surface. A single preamble-reference carve would help every
tier->=2 skill at once. Records the why, the cold-vs-hot split to measure,
and the guards it needs. Not implemented this PR.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Garry Tan
2026-05-31 08:56:41 -07:00
co-authored by Claude Opus 4.8
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@@ -19,6 +19,38 @@ v1.47.0.0 baselines retained in `test/fixtures/` for the v1→v2 audit trail. Th
captured skill bytes match `origin/main` exactly (the rebasing branch left every captured skill bytes match `origin/main` exactly (the rebasing branch left every
SKILL.md untouched). `bun test` is green again. SKILL.md untouched). `bun test` is green again.
## Token-reduction follow-ups (Phase B, filed via /plan-eng-review on the plan-ceo-review carve)
### P3: Carve the always-loaded `{{PREAMBLE}}` reference blocks into an on-demand doc
**What:** The per-skill section carves (`/ship` v1.54, `/plan-ceo-review` v1.56) yield
real but bounded wins (-42% to -59% on the carved skill) because the shared
`{{PREAMBLE}}` (~40-50KB on every tier-3/4 skill) is the dominant always-loaded cost
and stays inline. Move the rarely-needed preamble REFERENCE blocks (the AskUserQuestion
split-rules and the CJK / lone-surrogate escaping reference) into an on-demand
section-style doc the agent reads only when it hits those edge cases, leaving the hot
path (voice, completeness principle, recommendation format) inline.
**Why:** Highest-ROI remaining token target. One preamble carve helps EVERY tier-≥2
skill at once, not one skill per PR. The eng-review on the plan-ceo carve flagged that
per-skill carves stay modest precisely because the preamble dominates the always-loaded
surface.
**Pros:** A single change reduces always-loaded cost across the whole skill pack.
**Cons:** The preamble is load-bearing and shared; a botched carve regresses every skill.
Needs the same union-parity + per-push freshness guards the section carves use, applied
corpus-wide.
**Context:** Builds on the v2 section pipeline (`scripts/resolvers/sections.ts`,
`{{SECTION:id}}` / `{{SECTION_INDEX}}`). The preamble source is
`scripts/resolvers/preamble.ts`. Measure which sub-blocks are cold (escaping reference,
split-rules) vs hot (voice, recommendation format) before cutting. Validate on one skill,
then roll corpus-wide.
**Effort estimate:** L (human team) → M (CC+gstack)
**Priority:** P3
**Depends on / blocked by:** The section pipeline (shipped v1.54). No hard blocker.
## gbrowser memory follow-ups (filed via /plan-eng-review + /codex on the v1.49 leak-fix PR) ## gbrowser memory follow-ups (filed via /plan-eng-review + /codex on the v1.49 leak-fix PR)
These four items came out of the memory-leak investigation that shipped These four items came out of the memory-leak investigation that shipped