legal: strengthen disclaimer, liability, and warranty language

- LICENSE: expanded warranty disclaimer covering silent failures from
  third-party changes, coverage gaps, regulatory non-compliance, and
  commercial licensee expectations. Explicit limitation of liability
  for privacy breaches, identity theft, and regulatory penalties.
- PRIVACY.md: added limitations section covering third-party changes,
  coverage gaps, user responsibility, and compliance disclaimer.
- README.md: detailed disclaimer with specific scenarios — site API
  changes, coverage gaps, user verification responsibility, and
  commercial license scope.
- Popup: expanded footer warning about third-party changes and user
  responsibility.
- Options page: added footer disclaimer with LICENSE link, updated
  version to 0.9.0.

https://claude.ai/code/session_01KF4i7Ra7zCEDskxDBaNtcT

LICENSE

@@ -29,10 +29,57 @@ refrain from using the Licensed Work.
 All copies of the original and modified Licensed Work, and
 derivative works of the Licensed Work, are subject to this License.
 
-THE LICENSED WORK IS PROVIDED "AS IS". THE LICENSOR HEREBY DISCLAIMS
-ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-NONINFRINGEMENT. IN NO EVENT SHALL THE LICENSOR BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-LICENSED WORK OR THE USE OR OTHER DEALINGS IN THE LICENSED WORK.
+DISCLAIMER OF WARRANTY
+
+THE LICENSED WORK IS PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT
+WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE, NONINFRINGEMENT, ACCURACY, COMPLETENESS, OR RELIABILITY.
+
+THE LICENSOR DOES NOT WARRANT THAT THE LICENSED WORK WILL:
+(A) DETECT, INTERCEPT, OR SUBSTITUTE ALL PERSONAL INFORMATION,
+    SECRETS, CREDENTIALS, OR SENSITIVE DATA IN ALL CIRCUMSTANCES;
+(B) FUNCTION CORRECTLY ON ALL WEBSITES, SERVICES, OR PLATFORMS,
+    INCLUDING AFTER THIRD-PARTY CHANGES TO THEIR INTERFACES,
+    APIs, OR DATA FORMATS;
+(C) BE FREE OF ERRORS, BUGS, INTERRUPTIONS, OR SECURITY
+    VULNERABILITIES;
+(D) MEET ANY SPECIFIC PRIVACY, SECURITY, OR REGULATORY
+    REQUIREMENTS, INCLUDING BUT NOT LIMITED TO GDPR, HIPAA,
+    CCPA, PCI-DSS, OR ANY OTHER DATA PROTECTION FRAMEWORK.
+
+LIMITATION OF LIABILITY
+
+IN NO EVENT SHALL THE LICENSOR, CONTRIBUTORS, OR DISTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+CONSEQUENTIAL, OR PUNITIVE DAMAGES (INCLUDING BUT NOT LIMITED TO
+LOSS OF DATA, LOSS OF PRIVACY, IDENTITY THEFT, UNAUTHORIZED
+DISCLOSURE OF PERSONAL INFORMATION, REGULATORY FINES OR PENALTIES,
+REPUTATIONAL HARM, LOSS OF BUSINESS, OR PROCUREMENT OF SUBSTITUTE
+SERVICES) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF OR INABILITY TO USE
+THE LICENSED WORK, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGES.
+
+THIS LIMITATION APPLIES REGARDLESS OF WHETHER THE FAILURE RESULTS
+FROM: (A) THIRD-PARTY CHANGES TO WEBSITES, APIs, OR SERVICES THAT
+CAUSE THE LICENSED WORK TO MALFUNCTION OR FAIL SILENTLY; (B) USER
+MISCONFIGURATION OR FAILURE TO VERIFY SUBSTITUTIONS; (C) PATTERNS,
+FORMATS, OR DATA TYPES NOT RECOGNIZED BY THE LICENSED WORK; OR
+(D) ANY OTHER CAUSE BEYOND THE LICENSOR'S REASONABLE CONTROL.
+
+COMMERCIAL LICENSEES ACKNOWLEDGE THAT COMMERCIAL LICENSE FEES ARE
+NOT INSURANCE PREMIUMS AND DO NOT CREATE ANY ADDITIONAL WARRANTY,
+INDEMNIFICATION, OR LIABILITY OBLIGATION BEYOND WHAT IS STATED IN
+THE APPLICABLE COMMERCIAL LICENSE AGREEMENT. THE LIMITATIONS AND
+DISCLAIMERS IN THIS SECTION APPLY TO ALL USERS, INCLUDING
+COMMERCIAL LICENSEES, UNLESS EXPLICITLY SUPERSEDED IN WRITING BY
+A SEPARATE COMMERCIAL LICENSE AGREEMENT.
+
+THE LICENSED WORK IS A CONVENIENCE TOOL THAT REDUCES — BUT CANNOT
+ELIMINATE — THE RISK OF INADVERTENT DISCLOSURE OF PERSONAL
+INFORMATION. USERS ARE SOLELY RESPONSIBLE FOR VERIFYING THAT
+SENSITIVE DATA HAS BEEN PROPERLY SUBSTITUTED BEFORE TRANSMISSION
+AND FOR IMPLEMENTING ADDITIONAL SAFEGUARDS APPROPRIATE TO THEIR
+USE CASE.