Sort community skills alphabetically

[drQedwards]

Why this PR

Follow-up to #111 implementing @kaankacar's request in #111 (comment).

#111 conflicts with main after #103 (copyValue blob URLs → raw.githubusercontent.com). Kan asked to rebase on main and apply the sort there, not resolve the conflict line by line (that would restore blob URLs). I cannot push to @mariaelisaaraya's fork, so this is the same change on current main.

What

• Sort all 29 ECOSYSTEM_CARDS by title (case-insensitive). Same permutation as Sort community skills alphabetically #111.
• Keep every copyValue as raw.githubusercontent.com (28 raw URLs, zero /blob/).
• Strip the two invisible characters from the StellarTools description (same cleanup as Sort community skills alphabetically #111).
• site/README.md: stop saying "Append to ECOSYSTEM_CARDS"; insert alphabetically by title (matches site/CLAUDE.md).
• site/CLAUDE.md: same insertion rule as in Sort community skills alphabetically #111.

No CI drift check here — Kan said that can be its own PR.

Test plan

• 29 cards, titles sorted case-insensitive
• no github.com/.../blob/ in ECOSYSTEM_CARDS
• pnpm check:ecosystem-links / pnpm lint / pnpm lint:ts / pnpm build on site-ci after this push

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[kaankacar]

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👀 Picked this up — a review will follow shortly.

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[kaankacar]

🤖 Automated message from Kaan's Automated Triage Bot.

Thanks for doing this rebase. It is the clean version that #111 was asked
for, and the sort itself verifies.

What I checked at 3924c13:

• One commit on current main, no conflict.
• Pure permutation: the same 29 cards, every field byte-identical.
• Case-insensitive title order is correct at all 28 adjacent pairs.
• SKILL_CARD_SOURCES untouched, zero blob URLs.
• StellarTools loses exactly two invisible characters (U+202F, U+2060).
  No visible text changes.
• site-ci is green at this head: lint, lint:ts, check:ecosystem-links,
  test:ecosystem-links and build all ran.

I am not merging, because two calls are not mine to make:

• The hold on Sort community skills alphabetically #111 (kaankacar/Automated-Triage-Bot#31) reserves merge order
  for this exact change. It is still open.
• This repeats @mariaelisaaraya's work in Sort community skills alphabetically #111, and she is still active
  there. Which PR carries the change is a maintainer decision.

One correction on the description: the comment you cite is from this triage
bot, not from @kaankacar. It did ask #111's author to rebase, and it ends by
keeping the hold. So the rebase request is real, but no merge decision was
made.

One fact that helps that decision: no open PR touches ECOSYSTEM_CARDS
today. #116, #55 and #49 only touch FILTERS and SKILL_CARD_SOURCES. So
the usual conflict cost of a whole-region reorder is near zero right now.

@kaankacar over to you.