docs: turn the organization profile into a task-based project directory - #3

Problem

The organization profile lists project names but makes visitors infer which repository solves their problem. ClipStash also uses its previous owner URL, and a generic open-source heading obscures project-specific licensing and release boundaries.

Changes

• Replace the flat list with a task / repository / scope directory using natural, relevant terms: HTTP and LLM proxy, document cleaning, PII redaction, chart-to-CSV, macOS clipboard history, XLIFF repair, and SRT/VTT transcription.
• Use the current canonical kiku-jw/ClipStash source URL.
• Describe ReliAPI's experimental resilience and Long Video Transcriber's benchmark gate explicitly.
• Direct visitors to each project's setup, license, release status and privacy boundary rather than implying uniform support or blanket reuse rights.
• Preserve contact links and the managed author-link block.

Verification

Read the existing profile and CONTRIBUTING.md; checked referenced repositories against the current accessible public inventory and checked the updated ReliAPI, DocStripper, ClipStash and Long Video Transcriber scopes against their READMEs. Existing descriptions of Masker, Chart2CSV and Untwine are retained in narrower task-oriented form. Only profile/README.md changes; no shared community templates, workflows, application code or licenses are modified. No runtime tests or traffic/ranking measurement were performed.

Repository About/topics and search-engine indexing are not changed by this PR. No private repository details are included. No merge or auto-merge is requested.