docs: fix renamed-repo links, drop stale assessment artifacts (#2058)

CONTRIBUTING.md still pointed at the old `affaan-m/everything-claude-code`
repo URL in the Quick Start fork instructions and in the Issues link at
the bottom. Both relied on GitHub's silent rename-redirect, but the
literal `cd everything-claude-code` after `gh repo fork` would land in
the wrong directory now that the repo is `affaan-m/ECC`.

REPO-ASSESSMENT.md and EVALUATION.md were both 2026-03-21 personal
fork-audit artifacts written from one user's specific install. They
describe the project as a fork at `Infiniteyieldai/everything-claude-code`
v1.9.0 with 28 agents / 116 skills / 59 commands and pin the recommended
mode at "use as upstream tracker". None of that is true anymore (this
IS the upstream, v2.0.0-rc.1, currently 61 / 246 / 76). EVALUATION.md in
particular still references a defunct branch (`claude/evaluate-repo-comparison-ASZ9Y`)
and describes a "Current Setup" of zero installed components as if it
were universal, which it is not.

Neither file is referenced by anything else in the repo (`rg` confirmed)
and they actively mislead new contributors and visitors. Delete both.

A targeted line-by-line refresh of EVALUATION.md was considered but
rejected: bringing only the totals up to date (61/246/76) would leave
the rest of the document — v1.9.0 references, branch metadata, the
zero-component "Current Setup" — internally inconsistent (CodeRabbit
flagged this on the first revision of this PR). Wholesale removal is
the honest fix.

Translated copies (e.g. docs/pt-BR/README.md still has the 28/116/59
numbers) are intentionally left for a follow-up i18n PR to keep this
diff small.

CONTRIBUTING.md

@@ -52,8 +52,8 @@ Slash commands that invoke useful workflows:
 
 ```bash
 # 1. Fork and clone
-gh repo fork affaan-m/everything-claude-code --clone
-cd everything-claude-code
+gh repo fork affaan-m/ECC --clone
+cd ECC
 
 # 2. Create a branch
 git checkout -b feat/my-contribution
@@ -499,7 +499,7 @@ How you tested this.
 
 ## Questions?
 
-- **Issues:** [github.com/affaan-m/everything-claude-code/issues](https://github.com/affaan-m/everything-claude-code/issues)
+- **Issues:** [github.com/affaan-m/ECC/issues](https://github.com/affaan-m/ECC/issues)
 - **X/Twitter:** [@affaanmustafa](https://x.com/affaanmustafa)
 
 ---