Update repository references for rename to ably-pubsub-php

[umair-ably]

Do not merge until the repository is renamed ably-php → ably-pubsub-php, in the programme's rename freeze window. Merging early points features.yml at the ably-sdk-builds-ably-pubsub-php IAM role, whose OIDC trust is bound to the new repository name, so the credential step would fail. Conversely, once the rename happens the old role name stops matching, so this is a same-window change in both directions.

Sibling of ably-pubsub-ruby#457, ably-js#2298, ably-java#1237, ably-dotnet#1332 and ably-python#682. Prepared ahead of the PHP split work; it only updates strings inside the repo and does not rename anything.

What changed

• .github/workflows/features.yml — repository-name: ably-pubsub-php. This input selects the per-repo sdk-builds IAM role, provisioned by infrastructure#13005 with the ID-qualified OIDC subject added by infrastructure#13054 (both merged).
• README.md — the licence badge's link target.

That is the whole repo-identity surface: there is no docs-upload workflow, and composer.json carries no repository URL.

Deliberately left as-is

• Packagist package name ably/ably-php — composer.json name, the composer require line and the poser.pugx.org badges. This is the package identity on Packagist, not the repository, and the legacy package keeps its name.
• ably-php/<version> agent identifier (src/AblyRest.php) and the tests asserting on it — a registered identifier; the family rename to ably-pubsub-php belongs to the split, gated on ably-common#361.
• CHANGELOG.md — history; GitHub's redirect covers the links.

⚠️ Packagist

Packagist tracks the package by its GitHub URL and updates via the GitHub webhook/app. After the rename, check the ably/ably-php package page on packagist.org: if it still shows the old repository URL, use Edit on the package to update it to https://github.com/ably/ably-pubsub-php and confirm auto-update still triggers on the next push. Packagist follows the redirect for fetches, but stale URLs are a known source of "not auto-updated" warnings.

Post-rename verification

• git ls-remote from an existing checkout and web redirects for repo / a PR / a file permalink.
• check.yml matrix green.
• features.yml run: AWS credential step succeeds and the upload lands at sdk.ably.com/builds/ably/ably-pubsub-php/main/… (the upload failure mode is silent).
• Packagist package page shows the new repository URL and auto-updates on the next push to main.

🤖 Generated with Claude Code

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[ttypic]

LGTM