chore: fix local pod build issue + remove CircleCI config

[dylanjeffers]

Summary

Two related housekeeping items. One of them (the pod fix) turned out to have no repo delta — see below.

1. Local pod build issue — fixed locally, no repo change

pod install was aborting with a fmt version conflict:

[!] CocoaPods could not find compatible versions for pod "fmt":
  ... fmt (= 12.1.0) ... fmt (= 11.0.2)

Root cause: the local node_modules/react-native podspecs had been hand-edited (mtime May 22) to bump fmt 11.0.2 → 12.1.0 across ~16 podspecs (third-party-podspecs/fmt.podspec, RCT-Folly.podspec, and the ReactCommon/React-* set). This was an abandoned experiment that predates the committed fix in #14403 (May 27), where we deliberately kept fmt at 11.0.2 and patched base.h via the Podfile post_install instead ("no equivalent backport exists for 0.79-stable yet"). The committed Podfile.lock pins 11.0.2, so the stale local 12.1.0 podspecs conflicted with it.

Fix: restored the drifted node_modules podspecs to the pristine react-native@0.79.5 versions (which are 11.0.2 — matching the committed lockfile) and cleared CocoaPods' stale Pods/Local Podspecs/ cache. pod install now completes, and the committed base.h patch applies cleanly ("Patched Pods/fmt/include/fmt/base.h … fmt 11.0.2 compat").

Because the drift was entirely in gitignored node_modules/Pods, there is no repository change for this — the committed state was already correct and reproducible (a fresh npm install ships fmt 11.0.2). Documented here for the record; the only thing in this PR is the CircleCI removal below.

2. Remove CircleCI config

CircleCI is fully disabled — the setup gate is equal: ['disabled', 'enabled'] (always false) — and is not coming back. Removed the entire .circleci/ tree (55 files, ~3,100 lines) plus dangling references:

• Dropped the validate-ci-config npm script.
• Removed .circleci/continue_config.yml from .gitignore.
• Removed the stale CircleCI build badge from packages/web/README.md.
• Preserved the one live dependency: the GitHub Actions publish-packages.yml workflow generates its Slack message from publish-packages-template.jq, which lived under .circleci/slack-templates/. Moved it to scripts/slack-templates/ and repointed scripts/publish-packages-slack-template.sh.

Follow-up (not in this PR)

The web/mobile GitHub Actions workflows still list - '.circleci/**' as a path-trigger. These are now no-op globs (the dir is gone). I left them out because editing .github/workflows/*.yml requires the workflow OAuth scope, which this client lacks. Trivial one-line cleanup for a follow-up with the right scope.

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