Build: Add export and module tracing to bundle-size bot

[jlukic]

The size bot learns to explain itself, designed for SNR: rows are findings, never inventory.

Changes

• from column on the changed-bundles table plus a , from x`` clause in the alert when one source dominates
• Tracked import costs: every export of utils/reactivity/query priced per PR with its module-graph fingerprint. The reporter clusters by graph transition and delta cohort, rendering one row per co-movement group named by its master (cheapest member, stable tie-break) — slaves are priced but never listed
• A master jump ≥ 512 B min earns an alert line even when no bundle moved — the single-export-grows-40% case that is currently invisible
• Signal/result table removed (it repeated the title, alert, and counts line) — the denominator moves into the changed-bundles heading
• ~170 fixture builds per collect (seconds), static analysis only, harness stays main-pinned

Risk

2/10

Trace failures degrade to measurement-only, one-sided traces to no-section, artifact fields sanitized before the privileged reporter renders. 42/42 harness tests. Consumption study in ai/workspace (private).

Sample comment — the five-pragma retention leak, rendered as implemented

🟡 Bundle size: component +371 B brotli · +0 shipped LOC for demo123

Base: main · Run: #0 · Raw: size-report.json

^Demo

[!WARNING]
component grew +371 B brotli to 48.8 KB (+0.7%, from utils/strings.js) across +0 shipped LOC.
Import costs moved: $ +1.45 KB min (query), joinWords +1.44 KB min (utils) and 6 more — see Tracked import costs.

2 larger · 0 smaller · 22 unchanged · +0 shipped LOC · +0 comment LOC

Bundles that changed (2 of 24)

bundle	brotli	Δ brotli	change	from
component 🎯	48.8 KB	+371 B	+0.7%	utils/strings.js 100%
framework	130.1 KB	+342 B	+0.3%	—

_{Sorted by absolute brotli delta, increases first. 🎯 = bundle most relevant to this PR. from = share of the movement by source module, from the harness build.}

Tracked import costs (query · reactivity · utils): 9 moved

package	export	min	Δ min
query	$	39.3 KB	+1.45 KB (+4%)
query	registerBehavior	52.4 KB	+1.06 KB (+2%)
utils	joinWords	1.8 KB	+1.44 KB (+360%)
utils	capitalize	1.5 KB	+1.40 KB (+2143%)
utils	toTitleCase	1.5 KB	+1.09 KB (+288%)
utils	log	2.4 KB	+1.09 KB (+84%)
utils	getArticle	1.5 KB	+1.03 KB (+232%)
utils	toNumber	1.0 KB	+706 B (+193%)
utils	humanize	1.5 KB	+345 B (+30%)

_{The minified cost of importing just this export, standalone. One row per co-movement group, named by its master — full per-export pricing in size-report.json.}

LOC by scope: +0 shipped LOC · +0 comment LOC

No change in shipped source lines.

All 24 bundles, gzip, and raw sizes

bundle	group	brotli	Δ brotli	gzip	Δ gzip	raw	Δ raw
compiler	package	5.5 KB	—	6.2 KB	—	16.3 KB	—
component 🎯	package	48.8 KB	+371 B	55.8 KB	+363 B	170.5 KB	+921 B
query	package	15.9 KB	—	17.6 KB	—	52.1 KB	—
reactivity	package	5.5 KB	—	6.0 KB	—	16.5 KB	—
renderer	package	42.0 KB	—	47.9 KB	—	146.0 KB	—
specs	package	53.7 KB	—	63.5 KB	—	235.7 KB	—
tailwind	package	67.4 KB	—	85.3 KB	—	335.3 KB	—
templating	package	28.0 KB	—	31.3 KB	—	93.2 KB	—
utils †	package	17.3 KB	—	19.3 KB	—	49.9 KB	—
framework	framework	130.1 KB	+342 B	166.0 KB	+421 B	698.1 KB	+921 B
button	primitive	12.0 KB	—	15.1 KB	—	128.5 KB	—
card	primitive	3.0 KB	—	3.5 KB	—	15.8 KB	—
container	primitive	694 B	—	888 B	—	2.4 KB	—
divider	primitive	1.6 KB	—	1.9 KB	—	6.5 KB	—
icon	primitive	26.3 KB	—	35.0 KB	—	143.7 KB	—
image	primitive	776 B	—	993 B	—	2.2 KB	—
input	primitive	3.9 KB	—	4.5 KB	—	15.6 KB	—
label	primitive	1.3 KB	—	1.6 KB	—	5.5 KB	—
menu	primitive	14.1 KB	—	16.3 KB	—	64.3 KB	—
modal	primitive	1.7 KB	—	2.0 KB	—	6.7 KB	—
rail	primitive	534 B	—	695 B	—	1.5 KB	—
segment	primitive	3.1 KB	—	3.7 KB	—	19.7 KB	—
spinner	primitive	1.8 KB	—	2.1 KB	—	8.0 KB	—
table	primitive	555 B	—	692 B	—	1.3 KB	—

---

_{brotli q11 · gzip l9 · vs main · fresh build both sides}