docs(readme): improve project presentation

[shaypal5]

Summary

Refreshes the public README so a first-time developer can understand SynthBanshee quickly and evaluate the repository's scope, data boundary, and outputs without reading the deeper planning docs first.

What changed

• Added CI, license, Python, and audio-contract badges near the top of the README.
• Added the required creator attribution near the top and a bottom ## Credits section.
• Reframed the opening section around the AVDP synthetic Hebrew audio generation pipeline while keeping the sensitive AI-safety context sober and precise.
• Added a tracked waveform/spectrogram preview generated from an existing 16 kHz test fixture.
• Added an at-a-glance table, Mermaid pipeline diagram, output-surface table, dataset tier summary, taxonomy summary, quick-start commands, and explicit safety/data-boundary guidance.
• Updated repository metadata description and topics to match the public presentation.

Impact

Documentation-only. No runtime code, generation logic, labels, or dataset artifacts are changed.

Milestone

Checked open milestones. No existing milestone cleanly maps to this public README/presentability-only cleanup, so this PR is intentionally left without a milestone.

Validation

• git diff --check
• .venv/bin/python -m pytest tests -q -m 'not live_tts' (1773 passed, 1 deselected, 2 warnings)
• Verified README creator attribution appears exactly twice, with the top-line and bottom Credits formats requested.
• Verified the new preview asset is a real PNG and is tracked despite the broad assets/ ignore rule.

[Copilot]

Pull request overview

Refreshes the public-facing README to help first-time developers understand SynthBanshee’s scope, pipeline, inputs/outputs, and safety/data boundary without needing to read deeper planning docs first.

Changes:

• Added top-of-page badges, creator attribution, and a credits section.
• Reframed the introduction around the AVDP synthetic Hebrew audio generation pipeline with clearer safety/data-boundary guidance.
• Added a visual preview asset plus new “at a glance”, pipeline diagram, output-surface, tiers, taxonomy, status, and quick-start sections.

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[github-actions]

pr-agent-context report:

This is a refreshed snapshot of the current PR state.

This run includes an unresolved review comment on PR #115 in repository https://github.com/DataHackIL/SynthBanshee

For each unresolved review comment, recommend one of: resolve as irrelevant, accept and implement
the recommended solution, open a separate issue and resolve as out-of-scope for this PR, accept and
implement a different solution, or resolve as already treated by the code.

After I reply with my decision per item, implement the accepted actions, resolve the corresponding
PR comments, and push all of these changes in a single commit.

# Copilot Comments

## COPILOT-1
Location: README.md:149
URL: https://github.com/DataHackIL/SynthBanshee/pull/115#discussion_r3330269813
Root author: copilot-pull-request-reviewer

Comment:
    The Credits attribution link text contains a trailing space (`Affek `) which will render inconsistently and may fail exact-match checks for the requested attribution format. Remove the extra space inside the markdown link text.

Run metadata:

Tool ref: v4
Tool version: 4.0.21
Trigger: review posted
Workflow run: 26713745397 attempt 2
Comment timestamp: 2026-05-31T20:09:29.086114+00:00
PR head commit: 9cf1681ad37ffd0bc7c46f3186f000776441565c